Work Text:
You would have been in a better mood if you didn’t have to climb a goddamn mountain. Would have been in a better mood if he didn’t act like a stupid little shit who knows no gratitude after you flew all the way from Hogwarts with Highwing’s help.
You wanted to punch his perfect teeth when he accused you of not caring about his sister. As if it’s also your responsibility now to cure Anne. But you backed away like you always did, only reassured him of your good faith.
It’s not worth it, you told yourself. You’ve worked hard to build a good name in school and earned the trust of lots of people. You’re not gonna let Sebastian’s childish tantrum ruin it.
You saw Thestrals on your way up, he muttered something about them being a bad omen. That’s unexpected coming from him, you think he’d know better than talking like an ignorant peasant.
“Not everyone does.” You simply replied.
“I know that.”
“Alright.”
“I’m making small talk. I’m not going to trek up this mountain in silence.”
You’d prefer silence. Because another wrong word from him you would end up doing something that you’ll very much regret later. But you wondered if Sebastian could see them because he witnessed his parents’ death, or if it’s something else, that he had killed something in his pursuit of knowledge involving Dark Arts, for example. It wouldn’t surprise you.
He must have practiced the two curses he taught you on something, otherwise how could he knew he’s teaching the right thing? On what, though, is another one of Sebastian’s secrets that you’re looking to find out about.
The thought came to you before when the three of you, Ominis included, were in Slytherin’s scriptorium. And every time Sebastian teaches you an unforgivable curse, he always says ‘you have to mean it’. You were tempted to ask him right there and then, what does it mean then, when we curse on each other? Do you want to hurt me and give me pain in that instant? Does it have to come with hate, or do you keep yourself aloof, convincing yourself that it’s merely a necessary thing to do for Anne? But you only told him you’re fine.
You saw lights from the goblin camp around the corner of the mountain path and started mapping out a way to tackle it. Maybe a disillusionment spell and a Revelio first to get the headcount of enemies. But Sebastian charged right in, saying he’s through planning. That fuckhead.
You found yourself more furious with him than with Ranrok and any other fiends on the Highlands. And it’s not because of the danger that he put you both in, nor is it because you didn’t like his choice of combat. You’ve always preferred frontal attack no matter how many enemies there are. After all, the thrill of bloodshed and the pleasure you take from watching them trying to put up a fight are irreplaceable.
The camp is moderate in size, hence it’s not much trouble taking all of the guards together head on. You slaughtered all the goblins there with the curse he taught you, Crucio. Frankly it’s not that unforgivable comparing to smashing people on the ground and have them die with bones broken like bread crumbs, which is what you do everyday.
Looking down on the remains of your enemies, you felt a dark sense of humor in you.
“Your blood is on Sebastian’s hands.”
Normally you would shift the blame to Ranrok.
Sebastian glanced you with a bewildered face, “Thanks for all the credits?”
“They would have lived if we sneak in and cast Petrificus Totalus on each one of them.” Though you wouldn’t really have done that given the chance anyway.
His expression was almost immediately twisted with disgust, “They got what they deserved.”
His temperament is getting increasingly annoying, just when you scarcely felt better from all the smashing and blasting. And you lash it all out on the goblins in the next two camps. You never admitted to Sebastian, but he makes a good, perhaps the best, companion on adventures outside of Hogwarts. He wouldn’t judge you for going a little too extreme and casting the unforgivable curses around. He’s actually quite proud of it judging by his tone when he hears those Latin syllables rolling out of your tongue.
With Natty and Poppy, you always had to be careful not to let it slip. Contrary to what Sebastian’s uncle believed, it’s actually common to cast the wrong spell when you have it up your sleeves and juggle between three different spell sets in an intense battle.
The joy of dueling with Sebastian having your back almost made you forget that you’re pissed at him. Almost.
And of course, he had to barge right into that cave.
“Sebastian, wait.”
“Wait? For what? Ugh. Why are you suddenly so cautious?” He turned around looking frustrated, as if you are the one being unreasonable and is merely tolerated here. That annoyed grunt gets on your nerve every time. But being patient and play nice pay off in long term, so you brushed it off.
“Listen to me. I know you’re angry and frustrated. But charging ahead now could undo all the progress we’ve made. Lodgok said —”
Sebastian interrupted you with that typical Slytherin sarcastic tone,“Oh, your goblin friend?”
And here you are, flying over mountains and rivers and fighting off a bunch of goblins, believed him when he said he’s over his issue with Lodgok and ready to work together again. Damn fool of you. As of Sebastian, he just wasted his last chance.
“That’s enough. Get on your knees.”
“What?” He’s stunned, unable to process what he heard.
“I said, get on your knees.” You give him a cold stare and raise your wand, “or if you prefer I give you a little help?”
Slowly, you see his expression turned as realization struck him.
“You’re not serious. Here?”
“I am. Now get on your knees or we part our ways here. Since you’re so capable of not getting us killed I’m sure you can handle this by yourself.”
Surprisingly, his face softened at your threat. It seems he’s much more yielding to an iron hand.
“No! I… didn’t mean that. We’re not getting answers, and now I can’t even visit Anne. It’s all very frustrating. I’m sorry.”
“Show it then. Don’t make me repeat myself again.”
Hesitantly, Sebastian got on his knees. You stood a few steps between each other, so he crawled over on his knees and finds your belt buckle without looking at you.
You waved your wand, a string of glow flew from the tip of it and tied Sebastian’s wrists behind his back.
“Use your mouth.” You instructed.
He glared at you but didn’t protest.
You’ve fooled around a few times before, so he’s rather familiar with how to undo your clothing. But it was never under such humiliating circumstances, never outside, in a camp with dead goblins around you, with his teeth. It usually happens in the undercroft where no one would disturb you. You’ve been thinking about taking him to the Room of Requirement where you could conjure a bed comfortable enough to explore more things, but his recent attitude is giving you second thoughts.
The sound of teeth bumping against metal sends an unpleasant chill done your spine. But the way Sebastian raises his head and lowers his eyes to focus on your belt nudged something inside of you. You grab a full hand of his soft curls to force him to look up and gently stroke his face.
His cheek is a shade darker somehow. You can’t be sure. It’s hard to tell under the moonlight.
“Now that’s a better look on that ugly face of yours.”
He looked away, brows knitted. Normally he would retort, countering with comments on your face. Is he hurt by your words, or just not in the mood for bickering? Either way, that reluctantly pliant look gives you the sick pleasure that you needed.
“Let’s keep it that way, shall we? You look even worse when you’re sour.”
He quietly went back to his work, pulling down your trousers and underwear with his teeth. It took him some time with buttons. Supposed there’s no book on ‘how to undo trouser buttons with teeth’ for him to read, you amused yourself. When your skin finally touched the chill air in the mountain, you saw him looking up at you briefly before taking your soft cock into his mouth.
You let out a groan from the velvet sensation in his mouth. Sebastian flattens his tongue and wrap it around your cock, allowing the crown to touch his throat as you grew harder. He’s getting good at this now.
His eyes are closed, and you see how his eyelashes shudder as you move your hip to thrust in a little deeper.
Your thumb caresses his temple as he opens up his throat to swallow you, “Yes, that’s the look I want. Finally know your place I see, who did you think you were telling me what to do and rushing in without me?”
He couldn’t apologize with his mouth stuffed full, so he leans in closer to wrap his lips around the base of your cock, almost choked on it.
“You know, Sebastian, I could’ve treated you better if you behaved, been thinking about fucking you on a bed, nice and comfy. But I suppose that’s more than what you deserve—”
He drew back and your fully erected member popped from his lips, which are shining with spit. Then he laps at the cleft, wraps his lips around the crown and sucks— made you lose your words for a moment- before taking in your full length once again.
“After all, you only ever used me to get the things you wanted. Always saying it’s for Anne, for your twin sister. But it’s really for you, isn’t it? It’s really you who couldn’t stand losing the Anne that you knew, you never asked her what she wanted. You selfish prick.”
You grab his hair and start fucking into his mouth. Merlin, it feels so good you scalp tingles. Sebastian lost his balance with your violent trusts and his hands behind his back, fell forward with his face hitting your groin. Your cock slams the back of his throat as a result and forced a muffled scream out of him.
“Fuck, at least you’re good for something.”
Drips of tears accumulated at the corners of his eyes, he squeezed his eyes shut as you used him like a toy. You wonder if it’s from the pain or from what you said about him. A couple of more hard thrusts and those tears fell, leaving beautiful trails on his face.
You kept fucking him in silence until you feel yourself approaching climax. When you finally pulled out, his lips are swollen and his eyes lost focus when he opens them.
You pulled him up and moved him to a tent nearby.
“Bend over.” You ordered.
Slowly, he bent over on a table.
You got rid of his robe with a swish of your wand and pulled down his trousers to admire the view from above. His perky arse shivers in the winter air. Robe is bad fashion choice, hiding all of this from you.
You’re half tempted to cast a spell to keep him warm, but that would defeat the purpose of this being a punishment and all. Surprisingly, you noticed his cock is already half-hard, prodding at the wooden edge. You almost laughed at the discovery.
“You’re hard from sucking my dick? How flattering.”
“Shut up.” Sebastian grumbled.
You let him preserve this last bit of dignity by not pursuing the topic further and turned your attention to the soft opening between his buttocks. You don’t have any lubricants with you, but nothing a little magic couldn’t solve. You stick your wand into his tight asshole and fill his inside with sticky fluid. As you work him open with your fingers, he suddenly spoke.
“Why do you even bother doing this with me?”
“What? You want me to split you open and make you bleed?”
“No…”It’s a shame you can’t see his face from this angle, “why do you do this if you… think so little of me? Why not just go find someone you fancy?”
Come to think of it, it’s Sebastian who started this in the beginning, after you dueled in the undercroft. The excitement of a good fight overcame him that he grabbed your collar and shoved his lips on yours. You started fooling around since and never put a name to whatever you’ve been doing.
“Never said I didn’t fancy you.” You pressed three fingers on that spot that always makes him tremble in joy, “Who else do you suggest, though? Ominis?”
He moaned at the sensation and you saw his cock jerked a little.
“He is prettier than you. Bet he sounds better when he cries, too.”
“…Sure. I don’t think he’ll turn you down.” He sounds very quiet when he said that, barely above the mountain wind.
“Like how he always let you get your way? Let you spill your secret meeting place to me, let you get into the scriptorium and use the Cruciatus curse, and let you walk away with the relic?”
He did them with your help, though.
“Don’t…ah…talk like you’re not part of it.” He grumbled, trying to hold back his whimper as you thrust faster with your fingers.
“True, I was your accomplice. Suppose that makes us partners in crimes, then?”
Sebastian had intended to say something, but you pressed the head of your cock against his slick hole.
“What do you say I put it in and fuck you good, partner?” You give his entrance a rub, lightly prodding it open.
“……Yes.”
“Don’t think I heard you.”
“Yes. Put it in, please. Fuck me.”
It sounds like he forced those words out of this teeth.
You smirked, very pleased with his response: “That’s better.”
You slammed in with full force, made the table under him squeak. He screamed, desperately gripped onto the front of your robe as you leaned in.
“Fuck…it’s too deep, I don’t think…I…”
But you’re not in the mood to show him mercy. You keep pounding into him, hold his hands down on his back and watch that pink pucker stretched smooth around your cock every time you bottom out. Sebastian has a hard time catching his breath with you so deep inside of him. He could only moan and groan, taking whatever you choose to give him.
“Stop gripping so tight, might hurt you.” You grunted.
You are usually more gentle with him, make sure he’s enjoying it as well. But Sebastian only has himself to blame today. You grip his hip tight, sure to leave bruises, and fasten your pace, almost abusing his soft walls with your cock.
He crumbles so beautifully under you, screams your name and begs you. Not sure what he’s begging for, though, his words became incoherent as his senses are overwhelmed. So you slowed down, pulled out and pushed in lazily.
“Fucking whore, tell me what you want.” You patted your cock on his buttock as you asked.
“Want you— your cock, want to come, please.”
You line your cock at his hole, already messy with all the lubricant and pre-cum.
“Well, what are you waiting for? Come and take it.” You smacked his arse as you said it.
Sebastian looked back at you, eyes glassy, then down to your groin. He pushed back his hip until the warmth of his inside engulfs you once more. He let out a satisfied moan and squeezed around your cock eagerly, pushing back and forth like a good little cock sleeve.
“You’re doing so good. Taking it so well. Where did you learn that from, hmm?”
His wits long abandoned him, couldn’t’ come up with anything in response, only fuck himself harder on your cock as those sweet little gasps escape his lips.
Pleasure built up in your groin from the tight suction, but you don’t want to come just yet. You grab his hair and pound in a few more times before untying his wrists and flipping him over to have him lay on the table.
Sebastian seems to be startled by the sudden change in position, he turned to stare at the tent wall instead of looking at you. When you moved in closer, he covered his face with his arm. You moved his arm out of the way only to see him raised his other arm.
“Don’t… don’t look at me, please. That’s all I ask for.”
So you did hurt his feeling. But instead of guilt, the power you have over him makes your head dizzy.
“Come now, you’re not as hideous as you think. Let me see it?”
Sebastian shakes his head violently, grips on your cock with his hole instead, perhaps in hope of distracting you.
“Can I at least get a kiss?”
He didn’t react at first, panting as you fuck into him in a steady rhythm. His legs helplessly hang in the air, so you guided them to wrap around your waist.
“I’ll close my eyes?”
It’s quite unfair that you accused him of getting away with things when you are actually the one who alway get what you want with your silver tongue.
You closed you eyes and leaned in. His hand grabs the back of your head and you’re pulled in for a soft kiss. It was innocent at first, just lips pressed together, until you couldn’t help but lick him open. You gently suck his bottom lip and poke at his teeth with your tongue, asking for permission. And he let you in, let you sweep his palate and shuddered at the sensation. His hand gets under your vest and feeling your lower back through a layer of fabric.
You lift him off of the table and Sebastian cried out as your cock went all the way in because of gravity. You grind on his sweet spot and swallow all his moans and sobs, feeling him shaking in your arms. He broke off the kiss, a string of saliva between your lips.
“I’m going to come, I can’t… feels so good, it’s too much.” He buries his face in your neck and wraps his arms and legs around you as you bounce him on your cock.
You pressed a kiss to his earlobe, “Me, too. You want me to come inside?”
“…Yes, come inside. I want to feel it.” He’s unbelievably pliant now, probably a little cock-dumb.
You cast a silent spell to levitate him in the air and free one of your hands to stroke him. His cock is all wet and throbbing. You thrust in relentlessly, hitting his inside from different angles while rubbing your thumb on his cleft. Soon enough, Sebastian came with a broken cry, his eyes rolled to the back with the overwhelming pleasure, waves of spasms in his lower body caused his hole to clench around you, pushed you over the edge and make you shoot loads inside his arse.
“Fuck, that was something.”
You lowered him onto the table and watch his chest heave as cum starts to leak out, dripping down his thigh. You stomach stirs at the view. It’s all because of you, you made him so messy and dirty.
“You still mad at me?” Sebastian tentatively stole a glance at you.
“That’s my question. Are you done throwing tantrum because of my ‘goblin friend’?”
Sebastian let out a defeated sigh, “Said I was sorry. Or are you going to keep fucking me until you feel better?”
“As tempting as it sounds, we have work to do.”
You helped Sebastian get decent again and you two marched into the cave together.
“By the way,” Sebastian started, you hope it’s not small talk again, “You don’t really think I’m only using you, do you?”
“Of course not, we’re using each other. That’s what friends do, no?”
He snorted and didn’t say anything else.
Should have done this in the beginning if you knew that’s what it takes to get him in line. You thought to yourself.