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iniquitousyearning · 7 months ago

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SLYTHERINSLUT0’S KINKTOBER

october 4th — virginity loss / corruption kink.

PART ONE | kinktober masterlist. | 2024.

pairing: mattheo riddle x berkshires!sister

summary: mattheo’s conscience can only hold him back for so long.

warnings: 18+, hogwarts uni (putting this even tho it’s obvious), jealous mattheo, flirting, tension tension tension, “we can’t do this” type of vibe, “your brother is right over there” type of vibe. bestfriends lil sister trope. part one of two.

Morality—what is it, really? How is it measured? Is it a linear scale? Could someone be morally sound yet sometimes make an exception when the situation called for it?

Perhaps it's subjective. Anything that falls outside of the law, that is.

Mattheo forced a breath from his lungs, the drink in his hand was tasteless, some watered-down excuse for a cocktail. But that didn't matter, not really—what mattered was the way you kept laughing, the way your hand lingered a second too long on that random bastard's sleeve. The sight made something concerning coil tight in his chest, but he stayed where he was, back against the wall, sucking down drinks like he'd been tasked to it.

God, this was stupid. Morality. Right and wrong. He knew the difference, of course he did. Just because he was a Riddle didn't make him a monster. Not yet, anyway. But that line, the one between you and him—the one drawn so clearly in the sand—was practically mocking him with its absolutes and daring him to cross it. Forbidden, off-limits, the one thing he shouldn't want.

His best friend's little sister. The good girl. A virgin, no less.

"Riddle—you coming?"

Mattheo's head jerked slightly, but his mind was miles away.

He waved a hand. "I'll catch up in a bit.”

Malfoy and Zabini nodded, slipping into the night, leaving him behind in the dim, crowded ballroom. Spring dance. Hours past dusk. He didn't even know why he was still there. Normally, he was long gone before the clock struck twelve, but tonight the room pulsed with bodies and the music hummed under his skin. His drink was half-forgotten in his hand, and his gaze was fixed on a group across the room.

Or, more specifically, on you.

You were standing, black dress to your mid-thighs, half-listening to boys from your year drone on about quidditch tryouts and the usual chatter that filled the space between your breaths. But your eyes—your eyes weren't on them. You were looking at him. A soft smirk tugging at the corners of your lips, like you knew something he didn't.

His heart kicked against his ribs. Where was that line again?

You winked, and he sipped his drink. He'd always said bad decisions made good stories—but even if this (unnameable thing between you) was a story worth telling, the people to hear it would be few.

The tension grew suffocating and he finally looked away. You took that as a win, but you weren't about to let the game end there—not after you noted the tense of his fingers around his cup. You excused yourself from the group, your body moving through the crowd like water, fluid and unhurried, weaving your way toward him.

You knew the line well, the one Mattheo pretended so hard to respect. Restraint wasn't his nature—it never had been, not in the decade you'd watched him take whatever he wanted without a second thought. He wasn't made for holding back, and it showed every now and then—every time his lips crashed against yours in some hidden corner, whispering confessions of how badly he wanted more, how he ached for what he couldn't have.

You loved pushing him to that point. You loved knowing how bad he wanted you. Your brother would lose his mind if he found out. But that didn't matter, not even a little. Not when Mattheo looked at you like that.

"Having fun?" He asked upon your approach, his voice a shade too flat.

"A little." You leaned against the wall beside him, close enough that he could feel the warmth of your skin, your presence seeping into the space between you. "What about you? You seem a bit...tense."

"Tense." The word came out bland, barely audible, and he took a slow sip of his drink, like he needed it just to find his voice. "Why would I be tense?"

You wet your lips, slow, deliberate, studying him with that sidelong glance that made his pulse skip. His jaw tightened, and his eyes—those beautiful, dangerous brown eyes—scanned the room with something too close to desperation.

"Good question." You tilted your head, gaze playful, curious, like you were dissecting him right there in the half-light. "Maybe it's because you've been watching me like a hawk. Like you're waiting for me to do something...wrong."

"Maybe I'm just looking out for you," he muttered, his gaze sliding to your brother across the room, lips locked with some brunette. Mattheo's eyes flickered back to you, just for a moment. "Your brother's a little...busy, after all."

You raised an eyebrow, the corner of your mouth curving into an amused, almost wicked smile. "Ah, so that's it. You're just being my big, overprotective babysitter."

"I don't need to babysit you," he grumbled, though his gaze betrayed him, darting over to the group of boys you'd been talking to. "Just keeping an eye on the company you keep."

It was almost amusing—the way Mattheo stood there, sizing up your guy friends like they were targets in a lineup, probably mentally noting who he'd hit first if any of them dared to step out of line. He was different tonight—and you could have brushed it off, could have let that flicker of vulnerability slide, but that wasn't how this game was played. Not with him. Not with you. There was no room for naivety here.

You turned to face him now, full-on, shoulder resting against the wall as you raised a hand, fingers brushing lightly up his arm.

"Keeping an eye," you repeated as you traced the hard line of his shoulder, then down, lower, over his chest. "Ever my hero, Mattheo Riddle."

When your fingers grazed his abdomen, his breath caught and he grabbed your wrist—hard—the suddenness of it making you gasp. Then, he turned to face you, and his gaze finally met yours—really met yours—for the first time since you'd crossed the room.

"Don't." His voice was low, strained, like he was fighting himself as much as you.

Your eyes widened in mock surprise, that innocent look you'd perfected like a sport. You wore it like a halo you knew you didn't deserve.

"Don't...what?" You damn-well knew what.

His grip tightened, just enough for you to feel the heat of it, pulling you closer, so close you could feel the tension radiating off him. He wet his lips, and you melted—remembering how it felt to kiss them.

"Don't play games with me." He said. "Not tonight."

The warning was clear, but instead of pulling away—heeding his words and letting that heat simmer down—you leaned closer, defying every unspoken rule. The thrill shot up your spine, into your brain, turning everything hazy, electric. You were drunk on it.

"Why not?" Your free hand traced up his other arm and his gaze followed the movement, lips parting ever so slightly. "...afraid you'll lose?"

Before you knew what was happening, he had you spun around—so fast you barely registered the movement before your back hit the cold stone wall. His drink found the table beside him, his focus entirely on you.

"Don't to this to me. Not here," he whispered. "Your brother is right over there."

You glanced toward Enzo, still too preoccupied with the brunette to notice a thing.

"He's a little distracted, don't you think?" Your fingers on your free hand resumed their path, this time up toward his collarbone. But his other hand found them, too. You looked down. Two large hands, wrapped tight around your wrists, like he could stop the fire running through your veins if he just held on hard enough. Your thighs shook. "Gods, you really are tense tonight, aren't you?"

Mattheo's eyes narrowed, two embers gleaming in the night— his lips twitching in a way that made your pulse stutter. There was need in him now, a raw, visceral energy that vibrated between you. Untethered.

He leaned in, closer, his breath brushing against your skin. "You're impossible."

"Impossible..." you echoed, the space between you shrinking with every second. There was no choice in it. It was magnetic, inevitable. He leaned closer, and you—against all reason—matched him, drawn by a force you couldn't name. "Impossible to...resist, Matty?"

Your lips were so close, you could almost taste the flavours lingering on his breath. The heat of him drew you in like gravity, pulling you into that dangerous space where everything blurred—boundaries, rules, reason. His eyes flickered down to your mouth, his tongue darting out to wet his lips in a way that felt instinctive—

And then, the world snapped back.

Cheering—loud, raucous—followed by the sharp crack of glass splintering against the floor. It cut through the moment, pulling you both back to reality. Mattheo's gaze jerked toward the sound, and in an instant he took a step back, his hands releasing your wrists like you'd burned him—like you were the danger here, a fire he'd gotten too close to.

"We can't," he whispered, and it sliced through you. It hit harder than the crash of glass, harder than the noise around you. "You don't want this. I promise you don't."

You stared at him. You knew what he meant, what he was trying to say, the warning etched in every tense line of his body. The two of you had been over this before. You knew Mattheo Riddle was not the man who would love you, not the man who would stay, who you'd call your forever. You weren't that naive. You weren't looking for forever—you just wanted a beginning. A first. A first that would teach you the edge of desire, with someone who knew what to do.

Someone experienced.

"I do," you whispered, barely holding steady under the weight of it all—the realization that you'd almost kissed him, right here, where anyone could've seen, where your brother wasn't far. "More than anything, I do."

His jaw clenched, that flicker in his eyes darkening. He ran a hand through his hair, curls falling messily back into place, his face twisted in thought, already calculating the fallout, already seeing the inevitable consequences.

"Your brother will kill me," he muttered. "He'll kill you."

"He’s not my dad, Mattheo. I’m an adult. He doesn't have to know." The words came out firm, too firm for how fast your heart was beating. You didn't dare move closer, but the tension between you was still electric, still alive. "No one except us."

For a heartbeat, his eyes locked onto yours, and you felt it—that gravity pulling you both back to the brink. It was visible—the weight of his indecision, the way he was measuring the risk, the pull of you against the walls he was trying to keep intact. It'd been months of this. You were relentless. His scowl deepened, but he didn't pull away. He let the silence stretch, your words simmering between you like a match lit, waiting to catch fire.

And then, a nod.

Barely there, just a sharp dip of his head, almost as if he didn't want to acknowledge it himself. You couldn't tell if it was for you, or some silent permission he was giving himself, a final surrender to the pull that neither of you could fight.

"Room of Requirement," he said, vibrating with the tension that still hummed in the air. "Ten minutes."

Your stomach leapt into your throat, every bone in your body suddenly weak. After a moment that felt as though it went on forever, you nodded, and he took another step back.

"Ten minutes." You repeated.

"Ten minutes." He confirmed, before turning and heading out of the ballroom.

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