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jagwis · 2 years ago

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Down the Undercroft

pairing: Sebastian Sallow x GN!Reader

word count: 4,103

summary: You decide to learn the Unforgivable Curses. You're lucky that Sebastian agrees to teach you. You're unlucky that he has special teaching methods. Seems like a bad idea to voluntarily climb into a snake's lair after all.

warnings: slight dubcon (completely con later), manipulation, unresolved sexual tension, spicy things (e.g. biting, kissing, pinning against the wall), mature language + canon divergence in using crucio, because i had to joke about microbes guys.

a/n: Reader is Ravenclaw, because i had a certain prompt in my head and it didn’t work for badgers, snakes and lions. although apart from one phrase in the fic, where it is mentioned that the Reader is a Ravenclaw, you will not find faculty mentioned anywhere else. no use of Y/N, no description of reader. also Sebastian and Reader are in their seventh year and over 18, i am NOT dealing with underage.

okay, burning question now: once again falling for Slytherin boys are we?

"I never said I didn't want to learn the Unforgivable Curses." It comes off your tongue a little rougher and sharper than you'd like. Anger at Sebastian and frightened Ominis’ voice still press on your thoughts from the inside, entangling them in a furious fog and coloring intonation in displeased tones.

Sebastian freezes as he almost reaches the exit of the undercroft. When he slightly turns his head in your direction, his eyes glow with triumph.

"Is that so?" Sallow's honey-sweet words cut your ear with your favorite and hated smug intonation.

When you don't reply to his remark, Sebastian turns away from the door completely and, judging by his undisguised smirk, you realize that it's too late to back out now. You are trapped between a Slytherin whose self-satisfaction ripples around like incense in the Divination class, and between a cold dark undercroft. Oh, about that. You are in the undercroft where no one can find you, just asked Sebastian Sallow to teach you the Unforgivable Curses. Great.

While gloomy thoughts swarm like glumbumbles around your mind, Sebastian pulles out his wand and slowly approaches.

"Wipe your trademark grin off your face." You wince in displeasure when your words only make Sallow's lips stretch further. "I've always said it's wrong for professors to forbid us from learning any spells. Besides, I learned Confringo with you, didn’t I?"

"That you did." Sebastian's left hand rests on his hip, while the fingers of his right twirl the wand lazily. "However, Blasting Curse is nothing compared to the spells that torture, command and kill on the spot. Blowing up an opponent is slightly more humane than torture to death, don’t you think?"

Sallow takes another step forward, his voice becoming a conspiratorial whisper. You feel your body stiffen in response to his closeness. He never missed an opportunity to play with you a little, but never did he violate your personal space before.

"And certainly far more merciful than forcing someone to kill themselves... No?" Sebastian's breath tickles your forehead as he tilts his head to whisper in your ear. "With their own hands preferably." Sallow straightens up, putting back a saving distance between you. He's still annoyingly close, but at least not in his I-have-no-idea-what-we're-doing-standing-so-close-but-you-will-think-about-this-at-three-am position anymore.

"Very funny." From the narrowed laughing eyes opposite, you understand that your confusion from his actions cannot be hidden by faked confidence. The step back that you take to maintain this very confidence only amuses him more.

"You are well informed that Rookwood and Ranrok are looking for me. Runs in the name, I guess." You comment as you roll your eyes, causing Sebastian to chuckle. "I need these curses for self-defense."

Sallow raises his hands in mock surrender. "It's not for me to judge, love. But what should I say to Ominis? Poor thing thinks you're the voice of reason in our trio, you know."

"We have already discussed the use of pet names." You cast a disapproving look at highly pleased Slytherin. "And I won't lie to Ominis or hide anything from him. I just don't want you to make him do something against his will."

"Fair enough. He didn’t complain much before you joined our humble company, though."

"I do not want to know." You cut off, shaking your head. "Now, would you be so kind as to teach me curses already? Unlike some, I have a lot to do."

"Oh, don't I know it. I have to do half of these doings of yours, love." Sebastian tosses his wand to his other hand, moving behind you. Some strange inner voice is screaming at you that losing sight of Sallow is a bad idea. You tense up, already turning, when two hands are being firmly placed on your shoulders, holding you in place.

"What…" You start half annoyed, half wary, the undercroft’s shadows and the fact that no one can help you here suddenly act somber on you.

"Unforgivable Curses are dangerous even while they are being mastered." Sallow's voice, deeper and more serious, sends goosebumps through your body. "We wouldn’t want anything to go wrong, would we?"

When you don't answer, the long fingers tighten slightly on your shoulders, pressing down on your muscles.

"We would not." Understanding the hint instinctively, you answer, the grip on your skin loosening at your words. His one hand remains on your shoulder while the other begins to slide down your forearm. You freeze, concentrated on the touch. Through the thin fabric of your shirt, warm from the heat of your body, you can feel the coldness of five fingertips slowly rolling down your arm.

You think you can hear Sebastian swallow as he reaches your rolled up sleeve at the crook of your elbow, lingering there.

"Good. It would be a shame to kill you here." A small shiver runs through you as you hear the change of his voice. Sebastian sounds muffled, guttural. You'd give anything just to see the look on his face right now, to understand a little bit about what's going on.

"Speaking truthfully, I entertain the thought that we could do far more enjoyable things down here than putting you into danger."

You don’t have time to analyze his words, because all your attention is captured again by the movement of his hand, which overcomes the threshold of your sleeve and touches your bare skin.

A quiet sigh escapes your lips, to which Sebastian reacts instantly, pressing his fingers tighter, sliding them down to your wrist and wrapping around it.

You let him raise your hand to a chest level, align it to the position he wants. A huge question mark burns in your mind like a red neon sign.

"Does misleading me count as a part of your teaching methods?" Your voice sounds quieter and more intimate than a few minutes ago. Sebastian responds in the same velvety tone, and his lips are much closer than you initially thought, giving consideration to your hair, moving under his breath. This thought occupies you so much that you almost miss his answer.

"Am I misleading you?"

"With your actions. You are irrational." Your answer is intended to prick Sallow, but even without seeing you and your puzzled eyes, Sebastian perfectly feels the slight trembling of your wrist, securely hidden in his palm.

"On the contrary." Sallow removes his other hand from your shoulder and you feel your wand being deftly fished out from behind the bosom of your clothes. "I'm very sagacious when it comes to what I need. What I want."

Your wand settles with its usual weight in your hand when Sebastian offers it to you and slightly corrects your posture again, one hand holding yours with the wand clamped in it.

"The truth is, when I set a goal or, Merlin forbid, desire something." Sebastian tilts his head to the side, scratching your ear with his breath. "Rationality is my strongest trait."

You try to move away from Sallow, his captivating voice intoxicates you better than the Imperio Curse. Sebastian allows you to win a few tens of saving centimeters between you, while not letting you to pull your hand out of his.

"The first spell is the Cruciatus Curse. I do believe you know what it does. Always hold your wand steady or it might ricochet back at you."

Sebastian controls your hand and repeats the right movement several times before releasing your wrist from his grip.

"The main idea with Unforgivable Curses is the wizard's willpower. For the curse to work, you have to mean it."

You take a few deep breaths in and out, trying to urgently put your thoughts in order and focus. The lack of concentration after your impromptu hug with Sebastian, your friend and fellow student, is indeed dramatic. However, your talent for sorcery helped you get out of many other complex situations, so on the third breath you mentally call on all known wizards, wave your wand and firmly say: "Crucio."

A red flash erupts from the end of your wand and crashes into the stone wall of the undercroft, certainly dooming the several billion microbes that live on it to eternal suffering.

"Well done." Resounds behind you. "You looked so confused that I was ready to drag you to the Hospital Wing."

You are about to turn around and make a couple of flattering comments about your confusion and its reasons, but Sallow is quicker. Wrapping both arms around your waist, he presses his whole body against your back.

For a few seconds, both of you keep deathly silence. You, because Sebastian smells so damn good of sandalwood, probably after sitting through the Potions class before you met in the undercroft. Sebastian is silent because, knowing you, he is seriously taking in consideration how to avoid you practicing Crucio on him for all his antics today.

"Sallow." Your voice seems to be trembling, but because of the ringing in your ears, you can't tell for sure. "What the fuck."

Sebastian clicks his tongue in disapproval and rubs his cheek against the top of your head. "We're not finished." He purrs, breathing in the scent of your hair.

Without letting you go, his hand is again on yours and puts it in the right position.

"Next is the Imperius Curse." Sebastian rests his head in the hollow between your neck and shoulder. "It will allow you to force anyone to do what you want." Sallow shows you the right move but doesn't pull away this time.

"Sebastian." Your voice sounds almost pleading, to which he hides a chuckle, pressing his lips to your shoulder. "I- I can't cast it until you-" Your voice cracks, you clear your throat several times.

"Couldn’t care less." Sallow whispers, leaving dry kiss, a quick stroke of lips, on your neck. "The next curse is Avada Kedavra."

He supports you by the waist, the toe of his boot pushes your feet apart.

"This spell also needs a special posture."

"Sebastian." You speak louder, panic and arousal roll up to the bottom of your stomach at the same speed. Your fingers are cold, your cheeks are burning, heart is beating wildly in your chest. "Stop."

"Why would I do that?" Sallow runs his nose up your neck, stopping his lips at your ear, exhaling into it with a chuckle. "I can feel your pulse from the start of our little talking, silly. Your heart has been racing ever since."

"So what? Maybe I'm just scared by your growing insanity."

"You of all people should not be afraid of my insanity. You should be entirely and completely blamed for it."

You abruptly pull yourself out of his embrace, wasting no time turning on your heels and finally finding yourself face to face with Sebastian Sallow. The first thing you notice is his wand lying at his feet. He probably dropped it at some point, because he was too busy with what else (who, rather) could get into his hands.

Studying Sallow's face, you need a few seconds to recover and just enjoy the view in front of you.

Sebastian looks utterly smitten. He’s all fast breaths, eyes lidded in gaze of a pure bliss, pupils dilated, lips parted. His chest rapidly heaves, as if he’s trying to control his every breath through force. His fingers, nervously clenched into fists, tremble, like the fact that you have slipped out of his grip causes him almost physical pain.

The sudden realization of your power over him blooms in your chest with warm pleasure. You run your tongue over your lips, trying to make the final decision for yourself whether you want to be here, now, with him. Sebastian's gaze immediately jumps to your lips and fixates on them, the edge of his mouth twitching slightly, as if he forbade himself to repeat your movement at the last moment.

"Well, in that case." You straighten your back, trying to give yourself confidence and not show that your own self-control is cracking like glass under Depulso. Praying that Sebastian doesn't see how desperate you are.

"We must both be insane then."

You’re giving him your consent directly, and Sebastian reads it from your lips, as if drinking the sweetest nectar from the rim of a glass.

His eyes darken, unfailing smirk turning into a grin. He takes a step towards you, then again and again, while you hastily move back. Every step he takes forward is your one step back.

Your confidence is thinning with every meter that you overcome in sync. It almost feels like a dance, but when Sebastian in the torches’ half-light reminds you of a predator approaching to devour your soul, it’s more like dancing on coals, when every wrong move can mark the triumph of fire and your defeat. You giggle, remembering Sallow's love for fire spells, imagining yourself as a pillar of sparks if you anger him. Sebastian narrows his eyes.

"What's so funny, love?"

You are about to snipe as you open your mouth, preparing a caustic comment, when your back rests against the cold, damp wall of the undercroft. All cocky remarks die in your throat. You exhale, resting both hands on the mossy rocks. Your wand is still between your fingers. Sebastian lets out victorious sneer, caging you between his two hands, pinning you against the wall.

"Not so funny anymore, is it?" Sallow murmurs, looking at you. There are hunger, longing and something else in his gaze, similar to the tenderness of a collector preparing to pin rare butterfly with a needle.

Despite your position, you still try to maintain a bit of dominance and control. Therefore, tearing your palms away from the wall, you stealthily hide your wand behind the edge of your clothes on your waist. Feeling light-headed at his proximity, you grab Sebastian's tie with one hand and place the other on his lips, preventing him from closing the distance and kissing you. Sallow huffs in annoyance through his nose, giving you his brand menacing look.

You smile as you wrap the green and white fabric around your fingers.

"Yeah, what's so funny, Sallow?" You pull on his tie and Sebastian follows your instructions without question, getting even closer. In his eyes, black with desire, you see the reflections of fire from the torches of the undercroft. "Is that the right way to act when you want something? I'd like to hear the magic word."

Suddenly you feel a wet hot touch on the inside of your palm. In surprise, you pull your hand away, staring in amazement at the sly smile spreading across Sebastian's face.

"Did you just licked-"

"Poor little Ravenclaw." Sallow grabs both of your wrists and holds on tight, preventing you from moving. "Has anyone ever told you that snakes tend to eat birds?"

Your gaze darts from his hazel eyes to his lips as you try to get your thoughts in order. Sebastian is watching your efforts with keen interest. When you growl in annoyance from the overflowing desire to kiss the damn smile from his face, Sallow leans forward and covers your lips with his own.

Your breath hitches as Sebastian picks up a slow, painfully slow pace. You expected some violence and passion from him, but instead he kisses you the way a dying knight, devoted only to his mistress, kisses her palm for the last time. The kiss is sensual, soft, wet. Alluring. As if he is afraid that you will shatter like a mirage, like a dream inspired by a mind tormented by fantasies.

His lips are hot, the hands on your wrists clenching tighter as you return the kiss, rising up on your toes.

When he feels the responding movement of your lips, it seems that you have lost the poor boy for good.

Sallow releases your hands from his grip as you pull them demandingly towards yourself. Without breaking the kiss, he takes you under your head with one hand, holding your waist with the other, and pulls you closer. Your fingers are in his hair, slightly squeezing the curly strands. Sebastian seems to forget to breathe.

The kiss becomes faster, you pull each other more, further and, in the heat of touch, it seems that you become one lump of shattered breathing and pleasant shivering.

Sallow bites your lip, pulling it lightly with his teeth, then runs his tongue over it. You moan softly, parting your lips, and Sebastian melts in your arms, getting drunk from your voice and permission.

His tongue meets yours and deepens the kiss. You are being slammed into the wall, Sallow braces your face in both of his hands now, tilting your head as he wants. You allow him, trembling from all the unfamiliar sensations.

It feels good, but so hot, unbearably so. There is not enough air, too, but it is a pleasant suffocation, as if an oxygen void spreads in your chest being filled with an endless repetition of one word instead of air. Sebastian Sebastian Sebastian Sebastian Sebastian.

"Sebastian." You moan as you feel Sallow's lips on your neck, just below your jaw.

Sebastian freezes instantly, returning to your face – it takes a couple of seconds for his misty eyes to focus on yours.

"I think I just found your weak spot." He looks smug, but his voice is broken, and his eyes are pleading.

"Shut up." You whisper, stubbornly looking away.

Sallow grins, pushing your head back into place, hooking your chin with long fingers.

"What is it, darling? I know what you need, and I know what you want. All you have to do is ask politely."

You stare daggers at the proud Slytherin, who playfully runs the fingers of his free hand along your neck, raising a wave of goosebumps. His thumb on your chin circles your lip.

"Too much honor. Why would I bother?"

Sallow slightly scratches the skin of your neck with his nails, and you lean into his touch, causing him to chuckle.

"Because." Sebastian leans down, picking at the skin of your neck with kisses and bites. "I can make you feel good." Sallow returns to his original position, looking into your eyes with a burning glare of anticipation. "Be nice, won’t you? Is it really this hard to confess what you want?"

Sebastian watches your pupils dilate as you stare in fascination at his lips stretching into a seductive smile.

"Come on." Sallow gently tucks a strand of hair from your face, kissing you lovingly on the cheek. "Beg for me, love."

You instantly come out of the trance into which Sebastian without the slightest difficulty allured you with sweet voice and warm touches. Pride and stubbornness inflame in your chest a violent desire to resist.

"I don’t beg." You answer, firmly meeting Sallow's gaze. He frowns, puzzled by the change in your behavior, but once you believe in your small victory for a second, you see the familiar spark of an idea that flashes through the depths of Sebastian's eyes. It’s an all too well-known light that always means trouble. To you mostly, that is.

Sebastian straightens up to his full height, throwing his head back a little and looking down at you. You don't like the amount of triumphant glee on his face as you try to figure out his next move in confusion and panic.

"Oh no, love." Sallow purrs affectionately, you are bathed in the tart sweetness that pervades his every word. "I'm afraid now you do."

You notice too late that his hands are no longer touching your skin. It's also too late because you can't feel your wand in the bosom of your clothes anymore. The last thing you see before a green veil fills your vision is Sallow's right hand aimed at you with your wand clasped in his fingers.

"Imperio." Sebastian whispers and gracefully waves the wand.

With an impulse, you are slightly thrown back into the wall. It feels like you are spinning on a very fast carousel, or you are being at a very high altitude – not a single thought has time to reach your consciousness, as if invisible barriers reflect it.

Sallow watches with an unhealthy interest how the fog swirls in your eyes, green flashes are shimmering through the irises. You look up at him, your face free of all emotion.

"Beg." Sebastian commands, excitement and euphoria filling his entire being.

"Please, Sebastian." Your voice is the most beautiful thing Sallow has ever heard in his whole life. But when you pronounce these words under your breath, brokenly desperate, bittersweetly, he feels that he can come undone.

"Again." He orders, leaning forward, drinking in your every word. "Better."

You whimper, fingers clawing at his robe, but Sallow feels it as if your fingers are clenching right on his heart. It's stupid, embarrassing really, how much power you have over him without realizing it. Now it’s you who beg him, but for some reason he feels that he is the one kneeling in front of you, as if before an ancient deity on the altar, sacrificing his soul, praying that you will accept it.

"Please." You pleadingly look into his eyes. "Please, Sebastian. Please, please, please, please, please, please, I can't take it anymore." The cascade of your whispers falls on him with an unbearable weight. Sallow groans softly at your pleas, his eyes rolling back, and he must control every breath to keep him from choking.

He lets out another quiet moan, pressing his lips to your neck, covering it with open-mouthed kisses, bites, and licks, holding you in place with his fingers on your hips.

Sebastian knows the curse wears off as you relax in his arms, leaning closer.

"Sallow-" You begin with outrage ringing in your tone. "You-" The furious tirade is being abruptly stopped with a loud moan as you choke on it, sensing Sebastian leaving a hickey, effectively cutting off all of your displeasures.

You feel his chest vibrates under your fingers with laughter.

"What would Ominis say if he knew you were practicing the Unforgivable Curses on me?" You say revengefully.

"Don't use my best friend's name when I'm kissing your neck." Sebastian winces.

"Oh?" You mumble innocently. "And here I thought that it would amuse your ego."

"How so?" Sebastian pulls away from your neck, giving you a look.

"Well." You close the distance between you, biting on his chin for a second, hearing his breath hitches in his throat. "Because right now you are the one kissing my skin, not him." You trail wet kisses down Sallow's neck, leaving your own vindictive hickey. Sebastian flinches and groans, making you break into a smirk. "Because I'm being hold in your hands, not in Ominis', and finally-" You move higher, looking into his eyes. "Because when I begged a couple of minutes ago, it was your name that escaped my lips. Or am I wrong?" You smile slyly as you watch Sebastian open his mouth, completely stunned by your words.

"You are incredible." Praise finally escapes his lips when he tries to kiss you again, but you back away, chuckling as Sebastian whines in disappointment. A blush covers his cheeks, framing a constellations of freckles with warm color. You want to kiss all of them.

"I know." You wink at him, kissing him yourself, obediently wrapping your legs around his waist when he picks you up and takes you in his arms, leaning your back against the wall.

You are so absorbed in each other and in your undying duel for authority that you almost don’t catch the sound of the undercroft door opening.

You freeze in horror, Sebastian breaks into a big shit-eating grin. You now think that it is highly possible that only you did miss someone else’s company.

Sallow brings his index finger to his lips, signaling you to be quiet.

"I can hear you, you know." The voice of Ominis Gaunt resonates in the silence. Sallow's smile widens. "I'll leave you two doing Merlin knows what in my undercroft then, you filthy animals." He grumbles when he does not hear an answer from either of you. He hears perfectly clear, however, how you sink back to the ground, twisting out of Sallow's grip.

When Ominis turns on his heels and leaves the undercroft in a rage or nervousness, you are ready to cast Crucio on yourself. Already starting to move towards the exit to catch up with Gaunt and talk to him properly, you feel a strong grip on your wrist stopping you.

"You haven't finished your lesson." Sounds from behind.

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