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theostrophywife · 3 months

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HEART ON MY SLEEVE

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🤍 pairing: mattheo riddle x reader.

🤍 song inspiration: friends by chase atlantic.

🤍 author's note: the duality of man. this fic serves both cute, fluffy matty and jealous, possessive mattheo.

For his upcoming birthday, Mattheo Riddle had one simple wish: for his best friends to get along.

It shouldn’t have been such an ordeal except for the fact that you and Theo absolutely hated each other. If it weren’t for Mattheo, the two of you would have no reason to cross paths. Theo was an arrogant, pompous, quidditch playing prick with a terrible nicotine addiction while the closest you’d come to physical exertion is carrying your weekly stack of books from the library to your dorm.

Needless to say, you were not a fan of Theodore Nott. You thought he was a bad influence on Matty, while Theo labeled you as the buzzkill, often talking your best friend out of doing things that would either land him in detention or the infirmary. You got the feeling that Theo hated the fact that he had to share Mattheo’s attention with you. Never mind the fact that you were friends with him first.

The origin of your friendship started long before your days at Hogwarts. The first time you met Mattheo, his father invited you and your parents over at Riddle Manor to celebrate a successful business deal between your families. Even at a young age, you remembered recognizing the coldness and distance in the Riddle household. The elder riddle, Tom Sr., was a stern and unforgiving man who kept his family under his thumb. Tom Jr. played the perfect heir; cool, calm, and collected as he stood by his father’s side. Mrs. Riddle had a severe and somber air about her that sent shivers down your spine as she flashed an empty smile at you.

Mattheo was different from the rest. There was a warmth to him that radiated outwards, pulling you in with his cheeky dimpled smile and soft bouncing curls. He marched right up to you, bowing at the waist like he was taught to, except he nearly tripped over his feet and gave you a crooked little grin before correcting himself.

“Hi, Y/N. I’m Mattheo, but you can call me Matt.” There was a mischievous glint in his brown eyes that you didn’t recognize as trouble until much later. “Do you want to play with me?”

As it turns out, his definition of playing meant chasing each other through the hedge maze out on the manor grounds and absolutely dirtying up your pretty pink dress as you rolled around in the grass. You laid side by side on your backs, giggling as you tucked a flower into Mattheo’s curls.

“You’re going to get me in trouble, you know,” you stated matter-of-factly as you rolled over on your elbows. “My dress is all dirty.”

“Don’t worry, we can ask Tom to help us. He knows lots of spells and hexes.” He leaned in conspiratorially, holding his pinky finger out. “But you have to keep it a secret, okay? Can I trust you, Y/N?”

You hooked your finger through his, not knowing that such a simple secret would forever solidify your friendship. “You can trust me, Matty.”

In the years that followed, the two of you were as thick as thieves. Most days were spent at either the Riddle manor or your estate, which Mattheo tended to prefer since it provided him reprieve from his father. As of late, his parents had made it perfectly clear that he was expected to follow in his brother's footsteps. Despite it being Tom's first year at Hogwarts, he was already proving to be a gifted and talented wizard. When his father wasn't outright ignoring him, Mattheo was forced to practice hexes and spells that were beyond the knowledge of an eleven year old. Without his older brother to protect him, Mattheo felt the walls closing in in his grand yet inhospitable home.

You were the only silver lining in his otherwise dreary days. Mattheo thanked Merlin that his father allowed visits to your estate. Unlike Riddle Manor, your family home was warm, lovely, and full of life. During the summers, the two of you would venture out to the edge of your property and set up camp at the creek. The sunny days were spent swimming, climbing, and picking flowers from sunrise to sunset. On one particular day, you sat cross-legged on the picnic blanket, absentmindedly picking at the sandwich in your lap.

Beside you, Mattheo nudged you with his knee. “What’s wrong, Y/N?”

You blinked, trying to savor the sunshine for as long as you could. “I don’t want summer to end.”

“We’ll only be apart for a year,” Mattheo said softly, correctly guessing the cause of your apprehension. You weren’t surprised. He always seemed to know what was on your mind. “You’ll be joining me at Hogwarts before you know it. By then, I’ll be an expert so I can show you the ropes.”

“A lot can happen in a year,” you stated. “What if you make other friends and forget about me?”

“I might make other friends, but I’d never forget about you. You were my first friend ever. That makes you the most important.”

You looked up and found yourself face to face with Mattheo’s earnest expression. The corners of his lips tugged upwards as he nudged you again. “Besides, you know I’m going to write to you every week. Now that I’m in the same castle as Malfoy, I can finally crack the great mystery of whether or not he bleaches his hair.”

“There’s no way that’s natural, right? Maybe Lucius has a special shampoo or something.”

Mattheo grinned and draped an arm over your shoulder. “I don’t know, but I promise to find out for you.”

“You’ll really write to me every week?”

“Of course I will,” Mattheo declared, holding his pinky finger out. “You trust me, right?”

You smiled and hooked your pinkies together. “I trust you, Matty.”

When the next year finally rolled around, you were so excited that you convinced your parents to take you to King’s Cross at least an hour before your departure. You hadn’t seen Mattheo since the previous summer because his family had been away on holiday in Spain, but he stayed true to his word and wrote to you every chance he got. You loved reading about the friends he’d made, the antics he got up to, and most importantly, the fascinating classes that awaited you at Hogwarts.

As you passed through Platform 9 ¾, you were nearly knocked off your feet as Mattheo ran full force into you. He had grown much taller since you last saw him, so much so that he now towered over you as he pulled you into a bear hug.

“Hi, Matty,” you giggled against his chest.

“Hi, Y/N.”

Mattheo pulled away, grinning as he tugged at your hand. “Come on, I want you to meet my friends.”

You looked back at your parents who merely smiled at Mattheo’s excitement. To his chagrin, your best friend remembered to properly greet them and asked if you could board the train early. After much fussing, they eventually said their goodbyes and allowed you to go with Mattheo.

The first friend that you met was Enzo. He was sweet, if not a little cheeky as he hinted that Mattheo couldn’t stop talking about you all year. Draco and Blaise needed no introduction given that your families were all fairly acquainted ever since you could remember. To your delight, Pansy was amongst the group as well. The two of you used to take ballet together, so it was a relief to have another girl to bond with. The older boys, Tom and Regulus, briefly greeted you before returning to their own cabin.

Last, but not least, was Theodore.

Whereas the others welcomed you with open arms, Nott was not as warm in his reception of you. The two of you clashed right off the bat. You weren’t quite sure what the root of your disagreement was. Perhaps it was his snarky comment insinuating that girls couldn’t be proper quidditch fans in reference to your Chudley Cannons scarf, perhaps it was your biting retort that he could stick his misogyny up his arse. Either way, the interaction set the tone for your strained relationship.

Being sorted into Gryffindor only contributed to the animosity between you as well. Given the longstanding rivalry of Slytherins and Gryffindors, Theo was determined to view you as his enemy. The harder you fought, the harder Mattheo tried to repair the rift. You were the two most important people in his life and he couldn’t stand to see you two tear each other apart.

For the most part, you tried to grin and bear it. While you couldn’t for the life of you understand how or why he was even friends with someone as unbearable as Theodore Nott, you tried to be civil for Mattheo’s sake. Tried being the key word. With Theo’s snark and your temper, the two of you became known for your infamous fights. Still, it didn’t stop your best friend from trying.

Over the years, Mattheo concocted countless plots and schemes to get the two of you to bond. If his favorite band was playing in town, he would magically have two extra tickets to bring both you and Theo along. If there was a book release you were dying to attend, Mattheo would invite Theo along to check out the record store next door. If the castle was dead during the weekend, Mattheo would suggest a trio trip to Hogsmeade.

As much as you cared for Mattheo, your patience only stretched so thin. Without fail, every outing that the three of you went on almost always ended in an argument between you and Theo.

“I don’t know how you’re friends with both of us, Mattheo,” Theo joked as he gulped down his burger. “I’m fun and Y/N is —”

“Finish that sentence and I’ll stick my fork right through your hand, Nott,” you threatened with a sickly sweet smile.

The hostility wasn’t anything new, but you supposed that after dealing with it for years and years on end, Mattheo had finally reached his breaking point.

Your best friend pushed his plate away and sighed. “Let’s just go.”

You nodded in agreement, gathering your things and following Mattheo’s lead. Theo trailed after, obnoxiously squeezing his way through the door of the Three Broomsticks and letting it close behind him. You yanked it open, nearly pulling the bloody thing off its hinges.

“How very mature of you. Though I’m not surprised that you don’t know how to hold a door open for a lady.”

Theo looked back, craning his neck behind you. “As far as I’m concerned, there aren’t any ladies around. Just an infuriating little Gryffindor who can’t handle not having the last word.”

“I’m infuriating?” You huffed, crossing your arms. “Clearly you’ve never suffered through the pleasure of your own company. Spoiler alert, the snarky arsehole bit stopped being funny in third year.”

“Well, the uptight and bossy bitch bit wasn’t ever funny to begin with.”

“Enough already,” Mattheo yelled. You reeled back in surprise. Usually, your best friend just let you and Theo fight it out until you both got tired of it, but he wasn’t having it tonight. “You two are the most important people in my life, but you’re acting like bloody toddlers. I’m tired of feeling like I have to choose a side, so either you two find a way to get along or risk losing me as a friend.”

For the first time since you met him, you and Theo were both stunned into silence. Mattheo took one last look at his closest friends and marched off into the castle without a word.

The next day, you woke up feeling weary. You hardly slept last night given Mattheo’s ultimatum. Your best friend wasn’t the type to make declarations like that lightly, so you knew he meant it. Especially since he went straight to his dorm without coming over to watch a movie or talk late into the night like the two of you often did.

The suspicion was all but confirmed when you sat through a particularly awkward and tense breakfast. Mattheo briefly acknowledged you with a nod, not bothering to speak as he cranked up the music on his headphones. As the Smiths crooned, you looked up at Theo who shook his head at your inquisitive glance. You knew that Mattheo had most likely given him the silent treatment last night as well.

Despite the fact that you and Mattheo had very similar schedules, he managed to avoid you throughout the entire day. By the time the last class rolled around, you knew that he was serious about you and Theo making up. It was a hard pill to swallow. Truly, you’d rather ingest a pill the size of a hippogriff than make amends with Nott, but it wasn’t like you had a choice. You didn’t want to lose Mattheo.

Deciding to be the bigger person, you went to the one place that you knew Theo frequented. You found him sitting alone in the Astronomy Tower, long legs dangling below him as he smoked a cigarette. Biting back a comment about the death trap pursed between his lips, you cleared your throat.

“Mind if I sit?”

Theo tensed as he looked up at you. He wore the sneer that he solely reserved for you, but his eyes were dull and dim. The argument with Mattheo obviously left him feeling lost as well.

“Do I have a choice?” You glared in response, but took a deep breath to calm yourself. Theo winced. “Sorry. Force of habit. Sit, I guess.”

Gingerly, you settled in the spot next to him. “It’s bad, isn’t it?”

“He wouldn’t talk to me last night,” Theo confirmed as he ashed his cigarette. “Just put on his headphones and went to sleep facing the wall.”

“He’s been avoiding me all day.”

Theo sighed. “What are we going to do?”

“Look,” you started, trying to muster up the strength to propose your next statement. “Obviously, we hate each other, but Mattheo’s important to me and I know he’s important to you, too. So for his sake, can’t we just put all this animosity behind us and try to get along?”

“What exactly does getting along mean?”

You shrugged. To be honest, you had no idea how to approach the situation, but you figured you had to start somewhere. “I don’t know. Maybe we can grab a bite to eat. Make polite small talk. Try not to strangle each other in the process.”

“I guess I can do that,” Theo conceded. “Why don’t we go to the new pub in the village? I heard they have fried pickles.”

You perked up. “You like pickles? I thought I was the only one.”

“I don’t just like pickles. I love them,” Theo stated.

“Me too,” you grinned. “Mattheo always gives me his cause he says —”

“They taste like feet,” he finished with a chuckle.

You nodded, laughing along. “Well, what are we waiting for, then?”

Theo watched as you stood, smoothing the front of your skirt. You offered a hand out to him, both literally and figuratively. To your surprise, Theo took the peace offering and let you pull him to his feet.

An hour later, the two of you were squeezed into a tiny booth by the makeshift stage. The pub was lively tonight and nearly packed to the brim, thanks to the happy hour deal on their drinks and appetizers in honor of their grand opening.

The pickles didn’t disappoint. You ate a good amount, but Theo scarfed the whole thing down like he hadn’t eaten in months. As he finished a sandwich and gulped the meal down with his second butterbeer, you gaped in surprise.

“Honestly, where do you put it all?”

Theo patted his stomach, which was unfairly flat and probably housed perfectly sculpted abs despite his eating habits. “I’m a growing boy. I need to eat a lot to offset the energy I expend. Especially when I’m sparring with you.”

“Oddly enough, I’m flattered by that.”

“You should be,” Theo quipped. “I’ve never had to put so much thought into insulting someone until I met you.”

“I bet you were pissed when I took your crown as the sassiest and bitchiest person in our friend group.”

“I’ve never experienced such heartbreak,” Theo said sarcastically as he placed a hand over his heart. “I mean, to be dethroned by someone who can’t even reach the top shelf in the cupboard was truly the most humbling moment of my life.”

“Well, you shouldn’t have assumed that I knew nothing about quidditch just because I’m a girl.”

“I was a dick for that,” Theo admitted. “But I was also twelve. I didn’t even know what misogyny meant. I thought you were describing a disease.”

You snorted. “Well, the past is in the past. Even though I clearly won that argument, we should put it behind us.”

Theo rolled his eyes, but clinked his butterbeer against yours. “Cheers to that, Y/N.”

Surprisingly, you found that you and Theo had a lot more in common than you initially thought. When he wasn’t being a prick, he was actually quite nice to talk to. In a single conversation, you learned more about Theo than you had in years. The two of you possessed a knack for potions, preferred foreign literature, and shared a love for horror movies.

As the live band went on, Theo mumbled an obscure reference to an eighties muggle band that your mum used to blast when you were younger.

“I can’t believe they’re covering this song,” you shouted over the music. “I haven’t heard it in years.”

Theo’s eyes widened in surprise. “You know this song?”

“Of course I do,” you retorted. “Mattheo says I have the music taste of a divorced country club trophy wife.”

“You and me both.”

By the end of the night, you found plenty of common ground with the boy you once thought of as your enemy. It was quite alarming to realize that you hadn’t argued once all night and even more so when you found yourself actually enjoying Theo’s company. Maybe Mattheo was right after all. When you stopped viewing Theo as competition, he was actually not that bad. You now understood what Mattheo meant when he said that you and Theo were more alike than you cared to admit.

On the walk back to the castle, Theo pulled out a spliff but glanced at you before lighting it. “Do you mind if I smoke?”

“Knock yourself out.”

The moon was silver and bright against the cloudless sky as the two of you sauntered through the beaten path. You listened to Theo recount Tom’s disastrous attempts at asking Chloe out, all the while giggling to yourself because he was a bigger gossip than you and Pansy put together.

“Don’t let Tom hear you talking about his love life,” you teased. “He’d probably feed you to his basilisk.”

Theo grimaced. “Half of Hogwarts would weep at the loss of such a handsome face.”

“However will we survive without your wit and charm, Nott?”

He chuckled as he blew a ring of smoke up into the sky. You watched it float before holding your hand out. “Care to share?”

“I didn’t know you smoked.”

“Who do you think taught Mattheo how to roll his first blunt?”

Theo stared in disbelief as you took the spliff, inhaling deeply. You held the smoke in your lungs effortlessly before blowing rings of smoke in quick succession.

“Damn,” the brown haired boy exclaimed. “Who the hell are you, Y/N?”

You smirked as you tapped the joint. “Someone much cooler than you, Theo.”

After that night, you and Theo got on more and more. The banter and bickering was still there, but it was more playful now. Mattheo was glad to see his two best friends getting along so well. Since first year, it was all he had ever wanted.

The days of forcing you two to hang out together was long gone. Now, you were practically as attached to the hip with Theo as you were with Mattheo.

When Mattheo went up to the Astronomy Tower for a smoke break, he would find you sitting cross-legged across from Theo as he filled you in on the catfight between Lavender and Cho. When Mattheo visited you at the library during his free period, Theo was already there working on his History of Magic homework beside you. When Mattheo arrived at the Great Hall for assembly, he slid into the seat next to Theo as his friend craned his neck to peer at the crowd.

“Looking for someone, mate?”

“Yeah, Y/N said she was running late,” Theo answered distractedly. “I saved a seat for her.”

At first, Mattheo loved the fact that you put your differences behind you and became such great friends like he always knew you would, but as time went along, your best friend noticed that you and Theo were becoming a little too close.

On one occasion, Mattheo briefly excused himself from the common room party for a smoke only to come back to find you and Theo annihilating Draco and Blaise at butterbeer pong. He walked in right as you made the winning shot, witnessing Theo picking you up and twirling you around as Malfoy stomped off, grumbling something about an unfair play. A cheat of sorts.

Mattheo couldn’t help but agree. Seeing you in Theo’s arms felt like cheating. The whole thing made him feel strange. It didn’t help that every time the three of you hung out, Mattheo noticed that you and Theo now had little inside jokes and references that he didn’t understand. Being jealous of his best mate was ridiculous, but yet he couldn’t shake the uneasy feeling that only grew stronger with each passing day.

As you grew closer, Mattheo felt stranger. One morning, he nearly smashed his muffin to pieces when he saw you wearing Theo’s hoodie.

“Why are you wearing that?” he asked through clenched teeth.

You looked down in surprise as though you’d forgotten that you were wearing another man’s clothes. “Oh, I was cold so Theo let me borrow his hoodie.”

Mattheo frowned before pulling his sweater over his head. “Here, wear mine instead. It’s warmer.”

The gesture was confusing, but you merely shrugged and exchanged Theo’s hoodie for Mattheo’s sweater. “Thanks, Matty.”

Later that week, Mattheo found you in the stands in your usual spot before the game. He smiled when he saw his number painted on your right cheek. The brief moment of happiness was shattered when you turned and revealed that you had also painted Theo’s number on your left cheek. Mattheo nearly fell off of his broom. He was used to seeing his and only his number on you. First the hoodie, now this?

The green monster reared its ugly head during the game itself, motivating him to play as brutally as possible. The Hufflepuffs weren’t safe from his rage and neither were his teammates. As he soared around the goalpost, he hurled the quaffle as hard as he could, fully knowing that Theo was within the ball’s radius. Thankfully for him, Theo ducked at the last second before shooting a baffled glance at his friend. Mattheo simply ignored it and kept playing.

Despite their sweeping win, the bad mood failed to lift. Mattheo frowned as he slipped into the booth next to you, glaring at Theo’s head as the two of them sandwiched you on both sides. Across the table, the rest of the team sipped their celebratory milkshakes.

The waitress set down a vanilla, strawberry, and chocolate milkshake in front of the three of you. Mattheo watched as you and Theo tasted your drinks before promptly taking out the straw and switching flavors.

“Told you that you’d like strawberry more,” Theo said with a fond eye roll.

“But vanilla sounded good.”

“Everything sounds good at the moment, but you always go back to your favorite.”

Mattheo clenched his jaw as you stuck your tongue out at Theo before turning towards him. “Aren’t you going to drink your milkshake, Matty?”

“I don’t really have much of an appetite.”

“Maybe it’s just the chocolate. Do you wanna try mine?”

He shook his head, crossing his arms. “No, that’s Theo’s milkshake.”

“Oh, well if you want the vanilla one instead, I can switch back.”

Mattheo wrinkled his nose. “No thanks, Theo’s mouth has already been on it.”

“Consider it a privilege,” Theo butted in. “Most girls and boys at this school would kill to swap spit with me.”

“I’ll pass.”

You cocked your head at your best friend, looking concerned. “Are you sure you’re okay, Matty?”

He nodded rather unconvincingly. “I’m fine.”

As weeks passed, Mattheo only grew more jealous.

Granted, he was fully aware that he had no right to feel this way given the fact that he had practically pushed you and Theo together, but he just couldn’t help himself. The closer you grew, the more he regretted giving the two of you an ultimatum in the first place.

Before you became friends with Theo, Mattheo never had to share you with anyone. He realized now how much he had taken it for granted. Your best friend missed the times that the two of you spent alone. He missed having you all to himself. Mattheo was determined to get it back one way or another.

When Saturday night rolled around, Mattheo made his way up to Gryffindor Tower, glaring at anyone who balked at the sight of him on this side of the castle. After shoving McLaggen out of the way, Mattheo made his way up to the highest turret and let himself into your dorm.

You were perched in front of the vanity table, swiping your signature cherry lip gloss on in the mirror. Mattheo made himself at home, sprawling out on your bed. He knew you had plans tonight, but he was hoping to convince you to hang out with him instead. Mattheo eyed your dress, his gaze sweeping along the red fabric like a lover’s embrace. You flushed at the intensity of his stare as his brown eyes flickered back up to your face.

“Why can’t you hang out tonight?” Mattheo asked with a pout. “Are you going on a date? Is that why you’re leaving your best friend alone to perish?”

You shook your head in amusement before leaning over and giving him a kiss on the cheek. “Don’t be so dramatic, Matty. I’m not going on a date. Theo and I are just checking out this new band.”

Mattheo stiffened as you sprayed perfume on your wrists. “Why didn’t you invite me?”

“Theo did. He said you weren’t interested in listening to country club wife music.”

While that may be true, Mattheo would’ve gone if he knew you were coming too. “He didn’t tell me he was going with you.”

“Probably because he knew you’d feel obligated to go,” you responded. “But it’s alright, we won’t make you suffer through it. Theo will keep the creeps away.”

Mattheo did not like the sound of that. It was his job to watch over you, not Theo’s. Besides, he never thought of it as an obligation. Even if he wasn’t a fan of the music, he loved watching you jump around and have the time of your life. Spending time with you was the only reason why he insisted on coming to every concert. Keeping the creeps away was just an added bonus.

Now, Theo was taking away both. The realization put him in a foul mood, but he couldn’t let it show. He wanted you to have a good time, even if it wasn’t with him.

“Okay, but can we at least watch a movie and cuddle when you get back?”

“We’re going to be out pretty late. I don’t want you to lose sleep because of me. I know you have a Charms exam tomorrow morning, but I promise we can have a movie night tomorrow.”

Mattheo only nodded as you patted his curls and kissed his cheek again. He watched as you left your dorm, frowning into the mirror as he touched the two cherry gloss marks on his face.

The kiss prints were already fading, serving as some sort of sick metaphor.

To your credit, you did make good on your promise on movie night. It had been a while since the two of you hung out alone, which is definitely the only reason why Mattheo felt needier and clingier than usual. While his touchiness wasn’t anything new, he seemed determined to make it obvious to those around you. Especially with Theo.

During breakfast, Mattheo silently laid his head on your shoulder and placed your hand atop his curls. Across the table, Theo continued gnawing away at his croissant while you told him about the new horror movie that had apparently been banned in twenty countries.

“I wanna watch it,” Mattheo mumbled as you scratched his head.

“But you hate horror,” Theo responded.

“So? I still want to see it.”

“I’ll ask my mum if she can send me a copy this weekend,” you said as you playfully tugged at his curls. “We can watch it in your dorm, okay?”

He leaned in, nuzzling against your neck. “Just the two of us?”

“Of course, Matty.”

Mattheo brightened at that, happy with your response. Perhaps it was petty of him, but he didn’t care. He wanted to send a message. You and Theo could be friends, but he’d always be the most important person in your life. Mattheo was your person, just like you were his.

The others were beginning to pick up on things, despite his constant denial. It was sort of a moot point anyways, given the fact that he was single handedly proving them right with his actions. Nowadays, your friends would find Mattheo lounging on your lap, wedging himself in the small space on the common room couch just so that he was next to you instead of Theo.

Every time you went out to Hogsmeade, he’d make a point of holding your hand and carrying your bags. Mattheo would stop mid-conversation and rub your cold hands in his, blowing on your fingers because he knows how cold you get even in the heated pub.

“Your hands are cold. Let me heat them up, princess.”

As you blushed, Enzo would shoot Mattheo a knowing look, which he deflected by focusing all his attention on you. Even Tom made a passing comment at all the sickening nicknames Mattheo had taken to calling you lately.

“Hi, sweetheart. Is this seat taken?”

“Morning, love. Do you want to go for a walk with me?”

“Here, give me your bag. I’ll carry it for you, darling.”

Though his older brother might disagree with his methods, Mattheo was quite convinced that it was working. Until it wasn’t.

During the last week of December, you and Theo began acting strangely. Every time he walked into a room, the two of you would fall uncharacteristically silent. When he tried to bring it up, you evaded his questions and changed the subject instead. The secrecy didn’t sit well with him.

After the last class of the day, Mattheo usually walked with you to the library, but every time he tried to find you that week, you had all but disappeared.

“Berkshire, have you seen Y/N?”

“Oh yeah, she left with Theo a few minutes ago. Seemed urgent.”

“Did they say where they were going?”

Enzo shrugged nonchalantly. “No clue, mate.”

Frustrated, Mattheo walked away before succumbing to the urge to throttle his friend. It wasn’t Enzo’s fault that you and Theo were acting so weird. Throughout the week, Theo would be out of their dorm for hours and hours. Sometimes he wouldn’t even come back until the wee hours of the night.

When Mattheo checked your dorm, you were also nowhere to be found. He was trying his best not to spiral, but the nagging suspicion that the two of you were hiding something from him was too big to ignore. It was all but confirmed when he caught you sneaking out of the dungeons one night.

You poked your head out from behind a marble column, watching students pass. Clearly, you didn’t want anyone to know that you were down here. Unfortunately for you, Mattheo had already seen you.

“What are you doing here, Y/N?”

His voice startled you, making you jump a step back as you glanced up at him with a nervous expression. “Oh! Hi, Matty. I was just — I was just, um, walking back to my dorm.”

“I can see that, but what were you doing in the dungeons?’

“Just…hanging out…”

Mattheo could feel his blood boiling. “With Theo?”

You gulped, nodding in agreement. “Yeah, he had my book.”

“So where is it?”

“Where’s what?”

“Your book.”

“Oh,” you said softly, avoiding his gaze. It was a tell-tale sign that you weren’t being honest. You always looked away when you were lying. “I guess I forgot.”

“You forgot the thing that you came down here for?”

“Hm? Did you hear that?” You mumbled, despite the fact that the corridor was silent. “I think Pansy’s calling me. I gotta go, Matty. See you later!”

Your best friend watched as you sauntered off to Salazar knows where with a frown. Confused, Mattheo walked back to his dorm and found the answer to his dreaded question. As soon as he opened the door, the familiar scent of strawberry and vanilla filled the air. Mattheo felt downright murderous. That was your perfume. He’d recognize it anywhere.

Mattheo glared at his best friend, who was laying in bed with a book perched on his chest. He eyed the rumpled sheets and Theo’s disheveled hair while trying not to assume the worst.

“Is that the book Y/N lent you?”

“Huh? What book?”

Though he wanted very much to punch his mate’s teeth in, Mattheo restrained himself. “The book she came down here to get.”

“She wasn’t here for —” Theo closed his mouth before nodding reluctantly. “Oh, right. Yeah. This is Y/N’s book. I should — I should return it.”

“You’re acting weird, Nott. Both of you are.” Mattheo narrowed his eyes in suspicion. “What the bloody hell is going on?”

“Blase? Yeah, be right there, mate! I’d love to stay and chat, but duty calls. See you later, man.”

Theo hightailed it out of the dorm, responding to an imaginary summon. Y/N and Theo. Theo and Y/N. His two closest friends. Sneaking around. Lying to him. Fooling around in his dorm. Mattheo didn’t know how to feel. He was angry, he was sad, but most of all, he was hurt. His girl and his best friend? It was the ultimate betrayal.

Never mind that Mattheo had spent the past decade denying his feelings for you. Anyone with an ounce of common sense could see that he’d been in love with you since you were children. It was clear as fucking day.

When Friday rolled around, Mattheo decided that enough was enough. He was going to confront the two of you. After quidditch practice, he followed Theo through the castle. The git buggered off to some dark, secluded area of the school that Mattheo had never stepped foot in. He kept a safe distance, peering around the corner when he heard whispered voices.

“I’m telling you, he’s getting suspicious,” Theo whispered frantically. “He asked why our dorm smelled like you. I didn’t know what to say, so I bolted!”

His heart dropped when he heard you sigh in frustration. “For Merlin’s sake, Theo! You couldn’t make up an excuse?”

“Me? You were the one who got caught sneaking out of the dungeons. It’s not like you’re an expert on stealth, either.”

“You know I can’t lie to him,” you exclaimed. “I’ve never been able to, ever since we were little. He knows all my tells. But, Theo, he absolutely cannot find out about this!”

Mattheo didn’t need to hear the rest. His heart had already been crushed into a thousand pieces. He couldn't believe it. The two of you were supposed to be his best friends, yet here you were keeping this terrible secret from him.

For the rest of the night, he sulked in his room. He was in the middle of brooding while listening to the Smiths when he heard a knock.

“Piss off!”

“It’s me.”

Part of him wanted to send you away, but a bigger part — the stupid, idiotic, part of him couldn’t. With a sigh, Mattheo peeled himself off the carpet and opened the door. Since the secret rendezvous with Theo, you had apparently found time to get dolled up and changed into a pretty party dress.

Mattheo frowned and crossed his arms. “Theo’s not here.”

You frowned, cocking your head in confusion. “I’m not here for Theo.”

He scoffed in response. “You don’t have to lie to me anymore. I know.”

“You know what, Matty?”

“I know that you and Theo are…sneaking around. Lying to me. Hooking up behind my back.”

“What on Godric’s green earth are you talking about?”

“Don’t try to deny it. I heard you in the corridor upstairs. I’ve had my suspicions all week. The two of you have been acting weird and avoiding me. More than that, you have your own stupid little inside jokes and you take him to concerts and you share milkshakes! Those are things we used to do together, but now you’ve gone and replaced me.”

“The only reason Theo and I became friends is because you asked us to., Mattheo.”

“I know that!” Mattheo exclaimed, throwing his hands up in frustration. “I regret it so much. I wanted you to get along, but not like this. Now Theo’s making you laugh and walking you to class and doing god knows what else with you in our dorm!”

Your features softened as you tried to reach for Mattheo, but he took a step back. “Don’t try to deny it! I know you were in here the night I caught you sneaking out of the dungeons. I could smell your perfume.”

Realization flooded you all at once. “Are you…are you jealous, Matty?”

Your best friend crossed his arms and huffed. “Of course I’m jealous! I don’t want you doing any of those things with Theo. You’re my best friend. Mine, not his. I had you first. I loved you first.”

The confession stunned you into silence. You blinked, processing the information before holding your hand out. “Come.”

Mattheo looked like he was about to argue, but you just stared at him with determination. “Just come with me, Matty. I promise it’ll all make sense in a minute.”

The logical side of him wanted to refuse, but he knew it would be futile. Mattheo would’ve ripped his heart out of his chest if you asked him to. You were his weak spot.

Following you out into the corridor, Mattheo staggered a few steps back as you slipped into the dark and empty common room. With a snap of your fingers, the lights came on and voices echoed in unison.

“Happy birthday, Mattheo!”

Startled, Mattheo blinked at the sight before him. The common room was decorated with streamers and confetti, complete with a bright birthday banner that covered nearly half the room. There were tables filled with food and drinks, all of which were his favorites. All of his friends were present, including Tom, who stood to the side with his arms crossed. The pretty blonde beside him — Chloe, the girl Theo swore his brother was in love with — elbowed Tom, who sighed and flashed Mattheo a rare smile. Now that was something he needed to revisit at a later time.

For now, one shocking revelation was enough to deal with.

“Surprise!” You exclaimed beside him as you pulled him into a hug.

At first, he was too stunned to return the gesture, but eventually he wrapped his arms around you and pulled you in for a bear hug. With everything going on, Mattheo nearly forgot his own birthday, but he knew that you wouldn't. You did all of this. For him.

When you broke apart, Theo clapped him on the back. “Happy birthday, mate.” Relief washed over his friend’s face as he spoke the words. “Thank fucking Salazar that Y/N pulled this off. Hiding this from you for a week has been absolute hell.”

“So…this is what you two have been up to?”

You nodded in confirmation. “Mhm, Theo and I spent all week planning it. We wanted everything to be perfect.”

“But it was hard because you were being such a nosy little git,” said Theo.

The pieces started to click together. All that secrecy between his two best friends hadn’t meant what he thought it did. “So you two aren’t…you haven’t…you’re not hooking up behind my back?”

You and Theo stared at each other in horror.

“Ew!” Theo dramatically exclaimed. “Y/N is like my sister. You don’t hook up with your sister. That’s gross.”

“But I thought…you were hanging out together so much and you had all these jokes and it seemed like…”

“Please,” Theo scoffed. “Anyone with half a brain cell can see that you two are clearly in love with each other.”

“Surprised you figured it out then, Theo,” you quipped.

The brunette rolled his eyes at you before breaking out into a shit-eating grin. "Wait. Is that why you've been acting like such a twat lately? You thought I was making a move on your girl?" Theo's eyes widened as Mattheo shifted uncomfortably. "I'm right, aren't I? First of all, I'm flattered that you felt threatened by me."

"Threatened is a strong word," Mattheo countered.

"Please, you nearly took my head off with a quaffle." Theo wiggled his eyebrows. "Second of all, I'm quite frankly offended that you'd think I'd ever go for Y/N. I would never break your trust like that."

"I know, I know." Mattheo said with a sigh. "I was being stupid, but for a second I was truly convinced that something was going on between you two. I mean, you've been hanging out so much lately..."

“Matty, do you even know what we talk about when we hang out? You. It’s always about you. You were right that we both have a lot in common. We were just too stubborn to see it, but the main thing that brought us together is that we care about you so much.”

“Well, Y/N cares for you a lot more,” Theo teased with a smirk. “She’d like to care for you all night long.”

You flushed as deep and red as your party dress. “Oh my gods. Shut up, Theo!”

“My work here is done. Now if you’ll excuse me, I’m about to hit on that Ravenclaw who looks like she wants absolutely nothing to do with me.”

“Sorry about him,” you said as you turned back to Mattheo. “And sorry that we’ve been acting so shady all week. I just wanted to make sure you didn’t suspect anything.”

Mattheo chuckled. “Well, consider me surprised.”

You wrinkled your nose in disgust. “I can’t believe you thought I was hooking up with Theo.”

With a boyish grin, Mattheo pulled you to his side and kissed your temple. “I’m sorry, princess. Jealousy just got the best of me.”

“There’s no need to be jealous. If it wasn’t already obvious, I’ve been in love with you since we were kids.”

“I’m a bloody idiot.”

“Yeah, but you’re my idiot.”

Mattheo beamed and kissed the tip of your nose. “Thank you for doing all of this for me.”

You smiled softly, cheeks heating as he stared at you with bright, brown eyes. “Course, Matty, I just want you to have the best birthday.”

With a smile, Mattheo leaned down and pressed a soft kiss against your lips. There was something familiar about the gesture, like the final piece of a puzzle clicking into place. Kissing Mattheo was as natural as breathing. It felt like coming home.

“Wish granted, princess.”

Later that night when he blew out his candles, Mattheo didn’t bother wishing for anything. You leaned into him as he hooked his pinkie through yours, making a silent promise. Even if it took a little jealousy for him to realize it, Mattheo embraced the truth wholeheartedly. You were his person and he was yours. As the flames died out, he smiled.

Mattheo Riddle had no use for wishes now that he had you.

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