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Breaking Boundaries

Mattheo Riddle x Reader

Brother’s Best Friend Trope

Summary: You're Enzo's little sister who he's very protective of. His best friend Mattheo Riddle can't help but be attracted to you.

Warnings: smoking, drinking, curse words, mentions of y/n, frat boy theo lol

all characters aged up.

It was your second to last year attending Hogwarts and Enzo’s final year. The two of you were attached at the hip since you were born; knowing he wouldn’t be there with you at your final year, you were somber. He assured you that you’d be fine and he’d apparate at an owl’s notice if he found out you were in trouble.

“Don’t be gloomy, y/n,” Enzo encouraged. He looked out the door, seated comfortably in front of you. The train had yet to depart. He glanced at you again, noticing your crossed arms, “We’ll spend a lot of time together this year, there’ll be loads to do… I’m excited for the party this weekend.”

You looked at Enzo, feeling a little better. “Enz you know you’re only looking forward to that because you haven’t touched a drink this entire holiday.” He looked at you with a smirk, he knew you were right. He argued that it would help with his tolerance: drink less and still get wasted.

The sliding door opened and Enzo’s friends entered one by one.

“Oi! Is that really you Enzo? Quite a tan you’ve got there!” Theo exclaimed. You noted the tight polo and the cap he wore sideways.

Each of them dropped their luggage to exchange hugs and handshakes. The only one who seemed to notice you was Mattheo.

“Hi y/n… You’re gonna hang with us this time?” he asked as he lifted his luggage and packed it into the overhead bin. Mattheo spent the most time with your brother this summer while everyone else traveled.

Usually, you’d be with your friends who were in the room next to Enzo and his group, but you decided to be with your brother since it was his last train ride to Hogwarts.

You looked at Mattheo and answered, “Yes, just ‘cause it’s Enzo’s final year. Hope you don’t mind.” The banging of luggage filled the silence and the roomette began to smell of various colognes.

Theo cockily butted in the conversation, “Don’t forget it’s also our final year.” as he proudly banged his chest. Everyone was settling in, Enzo moving to sit next to you so you wouldn’t feel awkward.

The train ride back to Hogwarts was nothing short of deafening. Everybody was chatting about their summer holiday and if not about their summer holiday, then quidditch, and if not quidditch then girls, and if not girls, it would be about the parties they planned on throwing. You tuned in to the conversation about the Slytherin Welcome Back Party. You’ve attended them since your third year and have always looked forward to it when school started.

~

Once the train arrived to Hogwarts, your brother and his friends started to pick up their luggage. Their height was an advantage for them to swiftly gather their bags and exit the roomette. The night sky made it difficult to look for your belongings above, but a hand reached out and picked it up for you. Behind you, you saw Mattheo holding your trunk with one hand and his belongings in the other; the veins on his arms paired well with his muscles.

He moved his hand towards you, ushering you to pick up your stuff. Your eyes never left his as he made sure you didn’t drop anything. After all these years of knowing him, why did it take you so long to realize how attractive he is?

You didn’t seem so different than your brother at that moment.

“Er- you’re welcome?” Mattheo broke the silence.

You were grateful for the darkness since it hid the obvious blush on your face. All you could muster up was a rushed ‘thank you’ before speed walking past him and catching up to Enzo.

~

Hours before the party, everyone in Enzo's and your group helped set up. Each person had their own task in preparing for the party: Draco and Blaise getting the drinks, Theo and Mattheo charming a muggle herb ‘marijuana’, and Pansy decorating. The group always left you and Enzo for anything involving transfiguration.

“Geminio.” you incanted, pointing at the few shot glasses that instantly turned to hundreds. Enzo was turning a studying desk into a wet bar while Pansy dimmed the candle lights and enchanted the light bulbs green. Mattheo and Theo sat by one of the tall windows, attempting to pronounce the correct charm for the weed.

While the two of them were goofing off, you couldn’t help but notice how attractive Mattheo was. His sharp jawline and curly hair that framed his intense eyes were like magnets to your eyes. You knew it was wrong to find your brother’s friend attractive. But he was just so captivating.

He caught you staring, then smiled and waved at you. You waved back then quickly turned back around, trying to hide your embarrassment. You could have sworn you also saw him wink at you.

“I finally got this stupid thing to grow,” Mattheo announced. “If anyone wants any just let me know.” he said, holding the pot up like a trophy.

Enzo glanced then went back to turning a coffee table into a pool table, “Save me one mate, I’m just about done.” he replied. The Slytherin common room looked like a club, nothing like the ominous dungeon that everyone knew it as.

Before the party officially started, everyone drank a few shots to pregame.

“So who is going to do all of this work next year?” you asked Enzo, the burning sensation from the liquor affected your voice.

“You and Tori..?” Enzo barely responded while his throat felt ablaze.

“Oh, and Crabbe and Goyle! I’m sure with their low marks on their N.E.W.T.s Dumbledore would want to keep them for another year.” Draco replied dryly. There was an eruption of laughter while the blonde man rolled his eyes.

After, Theo and Blaise went up to the entrance of the common room to start letting people in while Enzo started playing music.

~

As the night progressed, everyone was drinking and their inhibitions were nowhere in sight. You danced with Tori, Daph, and Pansy by the fireplace while the boys were sprawled around the common room. The bass from the music was vibrating through everyone’s chest. The mysterious, hot, ‘Dark Lord’s son’ would keep exchanging glances with you throughout the party.

Your slightly revealing outfit helped you move freely while you moved your hips.

Pansy leaned into your side, "You know, if you two keep going at it, I'm afraid your brother's not gonna like it." She inhaled a puff of smoke, dancing carelessly next to you. The dark-haired girl glanced over your brother, who was unaware of anything.

"Mmm, we're allowed to look right? It's not like it's illegal." you slurred, grinding against Pansy.

~

After a few hours of dancing and drinking, you wanted to check up on your brother. You knew he’d be wasted as he never failed to do so at these parties. He was by the wet bar along with Mattheo and Blaise. Before you could say a word, Enzo proudly slurred, “Am I that drunk or am I seeing double, Carrow?” You looked over to where he was looking, the Carrow twins were there, wearing the same outfit. Flora rolled her eyes while Hestia giggled. “Say, if you want, my dorm is available after this party.” he slurred, his head turning them as they walked past him.

You quickly went in front of him and grabbed his cup, “Enz, you know that the Carrows are twins right? Are you alright?” you asked, while taking a good look at him. His eyelids were lowered and his cheeks were flushed. You pulled out your wand and incanted aguamente into the cup and gave it to him.

“Y/n, I’m fine really, I’m having such a good time.” He hiccuped before drinking the cup full of water. Enzo’s head was spinning and his speech was incredibly slurred. Mattheo moved closer to Enzo, his height towering over you. He laughed at the sight of Enzo and put his arm over his shoulder in a brotherly way. You turned your head in Blaise’s direction and saw him pouring shots of firewhiskey and a dose of an alternate pepperup potion (that Draco liked to call soberup potion).

Blaise announced, “Alright blokes let’s take this next one.” while he handed them their glasses. You mouthed a ‘thank you’ to him before drinking the fiery elixir. He raised his glass in response.

Half an hour passed and Mattheo was as crossed as ever. In comparison, Enzo had sobered up with the help of the potion and some throwing up. You guys decided to regroup with everyone near the fireplace. That’s where Enzo noticed that Mattheo was looking at you more often. He paid no attention to it until he saw him eyeing you up and down.

“Something on your mind?” Enzo asked, trying not to seem overprotective over you. Enzo took a quick look at his sister, who was swaying vivaciously to the rhythm of the music. You paused to take a shot that Pansy lifted with her wand. Your brother knew you were wasted.

“Your sister is fit.”

“I will gouge your eyes out.”

Mattheo stopped drinking from his red solo cup and looked at your brother. He hadn’t realized what he said until he was met with Enzo’s dark, threatening glare. He cleared his throat and laughed at an attempt to smooth the issue. If it was any other guy, Mattheo would not be threatened; his usual way of resolving issues of beating someone up would not work with his friend.

“Allow it Enzo, I’m just joking!” Mattheo said light-heartedly, hiding his fear of what Enzo would do “Besides, I’ve been looking at Tori this whole night.” the curly haired man tried to fixate on the wild, brunette girl but he was so damn distracted by the way your hips were moving.

He blinked, then noticed you weren’t in your usual spot. He looked to his left and Enzo wasn’t there either.

Enzo guided you to the opposite side of the room, far from Mattheo. He didn’t want to ruin your mood by making you stay in your dorm the whole night, so this was the best solution he could come up with. “Enzz, why here? Everyone is over thereee.” you whined, pointing at your girl friends.

“I’ll bring them over here, I just noticed you were a little too close to the fireplace. I don’t want you hurting yourself.” He lied, ushering your friends to move to where you were. You sat on a stool, kicking your feet and giggling.

You were drunk but you weren’t stupid. “Wait I know why you moved me!” your body became hunched as you pointed your finger at him, “It’s because me and Mattheo have been eyeing each other this whole night!” you laughed.

Enzo pulled his head back, with a disgusted look on his face. “Wait, you’ve been looking at him too? Y/n, he’s my mate, that’s rank.” He looked to the fireplace and noticed Mattheo wasn’t there. “Do not move from that stool, got it?” your brother commanded, his arms slightly squeezing your shoulders.

He looked for Mattheo, then went to Theo and Blaise to ask if they’d seen him. They shrugged, not knowing where he’d went. His last resort was their dorm, and he spotted Mattheo on his bed.

“Have you lost the plot? She’s my sister!” Enzo exclaimed, looking at Mattheo. He avoided his gaze, feeling scared and guilty. “You know you have a reputation of sleeping with any girl that glances at you, so why the fuck would I be okay with you looking at her? She's off limits.” he spat.

Mattheo finally lifted his head to look at Enzo, “You’re one to talk Enz. That black book you’ve hid under your bed since year 5? Don’t think you’re innocent.”

“Oh, as if you haven’t written in that book either? Seriously, back off from y/n. Consider yourself lucky that you're getting away with this because I care for y/n and because you're my friend.” Enzo swiftly picks up his wand as he walks out of their dorm, slamming the door as hard as he can. The room shook, slightly scaring Mattheo.

Mattheo put his head in his hands and sighed. He really tried to be subtle, but it was rather unfortunate timing that Enzo caught him in the act.

Meanwhile, y/n trucked her way to the nearest trash bin to empty her guts. Unfortunately, she was so drunk out of her mind that she ended up puking in a pot. Pansy and Daphne rushed to hold her hair up and take care of her.

Theo and Blaise spotted Mattheo outside of their dorm and walked up to him to ask what happened. Mattheo paid no attention to them as he noticed you in your sickly state.

He moved past everybody, not caring if he spilled their drinks, he needed to get to you. "Y/n how much did you drink?" he asked, grabbing the nearest cup to fill it with water.

"Eughh, Mattheo don't even look at me, it's not a pretty sight." you managed to say between gags. You took a break, trying to catch your breath and calm yourself down. Your heart was beating at a rapid pace and there was small chunks of puke in your hair. Your neck was down while your hands found comfort in the cold, stone floor. The sight of you made him sober up.

"Here drink this, where is your brother? Isn't he supposed to take care of you?" he asked, anger searing through his voice. He was worried about you, he could care less if Enzo saw him with you again.

You didn't have the capacity to speak, only nodding and accepting the drink. You swished the water in your mouth and spat in the same pot to clean your mouth. You were taking deep, shaky breaths. The bass from the music playing was ringing in your ears. He ordered your friends to find Enzo while he took care of you.

Mattheo unzipped his hoodie and wrapped it over you to keep you warm. You could barely keep your eyes open. He guided you to a nearby couch, and you slumped over his shoulder. Daphne followed you guys and casted a cleaning charm on you, ridding you of any remnants of throw up.

He was in an uncomfortable position. After his argument with his best friend, he didn't want to further disrespect him. But, he couldn't just leave you like this alone or with your friends who were as drunk as you. He reluctantly put his arm over you, rubbing your back as you fell asleep in his arms.

As time went on, the party slowed down. People from different houses began to move back to their respective common room. Enzo was nowhere to be found. Mattheo was fighting sleep to watch over you but ultimately failed. He rested his head on top of yours and drifted to sleep.

~

The sunlight danced through the Black Lake, making the common room look peaceful. Enzo woke up from a hot flash in his bed. He scanned his dorm thoughtlessly, looking for any more soberup potions. He accounted for his roommates, except for his best friend.

Enzo sluggishly put on his oversized hoodie and sunglasses to find him. He didn’t think he overreacted last night, agreed that he could have done more. But he just wanted to make sure that Mattheo was safe. He exited his dorm and noted the lingering smell of alcohol and smoke. Enzo winced as the sound of his slippers made contact with the sticky floor. He looked around, saw a handful of students fast asleep and some waking up with a hangover.

Enzo walked to the left wing of the dorm and saw two figures passed out on a couch. He could easily recognize Mattheo, but he didn’t know the girl he was with as her hoodie covered her face. Enzo was relieved to find his friend safe and didn’t want to disturb his sleep. But curiosity got the better of him and he removed the girl’s hoodie only to identify you. Your brother was completely vexed. You were off limits and Mattheo knew that.

"It's like you don't listen." Enzo said, waking Mattheo up. You were knocked out. His eyes adjusted to Enzo, his heart sinking immediately. Enzo stood there, arms crossed, shaking his head in disappointment. "What the fuck did I say about leaving her alone?"

a/n: omg hi guys this is my first post!! i was way too shy to upload this because I was seriously doubting my writing skills. but the more you write, the more you improve. i hope you guys enjoyed the story, stay tuned for part two ♡