Family Ties |p. maximoff| nsfw
A/N: step brother!pietro x step sister!reader, step sibling AU, taboo AU, 18+f!reader, oral f!receiving, just the tip, pervy!pietro, good girl!reader, smut, unprotected sex, stepcest(?) MDNI
When Erik Lehnsherr and your mom got hitched and she moved you and herself into his estate, you didn’t put up much of a fuss. You weren’t attached to your old town, you were going to college soon anyway so it wouldn’t really be a full move. Just a few months. The biggest challenge was his son, Pietro.
When you had first met him, it was during a brunch your mom and his dad had planned. Pietro shared his fries with you and you took some selfies with him just to document the day you met your future step brother. It was normal, you had enough common that it wasn’t awkward, and you exchanged numbers.
“You’re not what I was expecting.” Pietro had told you during a brief hug while you were saying your goodbyes after brunch. Erik and your mom were kissing a few feet away by her car.
“What were you expecting?” You asked with a little laugh as you leaned back, still in his embrace, to look up at him.
Pietro stared down at you with a small smirk and he tilted his head as he contemplated you. “My old man made it sound like you’d be younger, like some girl into princesses and fairytales. Not this,” He pauses and lets out a chuckle. “Not this beautiful girl all grown up.”
“You disappointed?” You asked playfully and Pietro didn’t exactly laugh, just smiled before saying, “Not at all, princess.”
That night, Pietro had sent you a selfie while you were curled in your bed just doomscrolling. It was a shirtless selfie, even if you couldn’t see his full chest, and he was winking and sticking his tongue out. Your face broke into a giddy smile as you read the message that came along with it.
Pietro M: for my contact pic, loved meeting you today, little sis;)
Even then, it still felt normal.
Then, of course, you spent a lot of time together in the months leading up to the wedding. Pietro was very helpful given his mutant speed and it was a gift your mother made sure to use whenever she needed something done quickly.
“One pair of far more comfortable heels,” Pietro had announced as he arrived to the hotel room with a gust of wind. Your face broke into a smile as you jumped up and wrapped your arms around his neck in glee. “Can’t have you tripping down the aisle and making me look bad.” He teases, one hand lately splaying over the small of your back.
“Thank you so much, you’re a lifesaver.” You laughed, pulling back and taking the shoes which had a chunkier heel for the sake of your balance. “Look, mom!”
“Those are perfect, sweetheart.” Your mom sighs in relief before cupping Pietro’s face in her hands. “Thank you so much, son.”
“Of course, happy to help.” Pietro says as he gives her a hug while watching you slip into your new heels, his eyes trail over your bridesmaid dress which clings to the curves of your hips and waist. You catch his gaze and blush, looking away while he leaves to rejoin the groom’s party.
The wedding itself had gone perfectly. Everything went according to plan from the toasts to the dance to dinner. Except for when you were drunk and let Pietro kiss you in one of the venue’s back rooms. You had been trying to find a bathroom when your new brother found you stumbling around and you ended up in a cluttered room, whispering compliments and sneaking touches not quite appropriate for siblings.
“You look so damn good in this dress.” He told you, his hands messing up your hair while you giggled about how wrong this was even as you kissed him back.
“Mm, Pietro,” You murmured, gasping as his lips trailed down your neck. “We can’t. My mom literally just married your dad.”
“That’s what makes it so much hotter.” He says, grinning down at you before capturing your lips in another kiss. Your lips part too easily and he licks into your mouth, tasting the sweet wine and frosting from the wedding cake as you moan. “Fuck, I should’ve objected.” He says, making you laugh as you playfully shove him.
The two of you had agreed it wouldn’t happen again. It was a one time thing, a mistake, even if it left you curious for more. You knew the energy would remain, however, and you tried everything to push back the move-in date until it was no longer reasonable for you and your mom to continue staying at your small apartment when she was newly married.
There were no issues, not really. You didn’t feel like Pietro had forced anything, but you knew it would only blur the lines more once you were living together. His dad was nice and friendly, he made your mother happy, and when you arrived at your new home you found that Erik had set up your bedroom before your arrival, and that made you feel more welcomed than anything.
“Go explore your new home, sweetheart.” Your mom encouraged after lunch, clearly wanting some alone time with her new husband.
Happily, you thanked your step dad for the meal and excused yourself before wandering the large house and its grounds. The halls were lined with large portraits and you noticed that some of them were a little askew. As you started to straighten one out, a sudden, but familiar gust of wind blew it off center again and you gasped as your hair flew around your face.
“Well, well, well,” Came a voice behind you and you turned to see that trademark silver hair paired with a cocky smirk. “Finally decided to move in, huh?”
“Hi, Pietro.” You say with a light blush because damn it, he is so hot.
“I’ve missed you.” Pietro says as he pulls you into his chest, his long arms wrapping around you as he squeezes and you grin, absentmindedly nuzzling into him. That cologne, you think, just like at the wedding.
When you pull away, Pietro tilts his chin to the portrait behind you. “We’ll have to get another one done now that includes you and your mom. My old man’s got a thing for family ties.”
“Oh, my mom would love that. She’s very into the Victorian era now thanks to your dad. Not quite the midlife criss I expected, but it’s better than her dating guys my age.” You joke and Pietro chuckles.
“You get the tour yet?” He asks, circling you once and you don’t fail to notice the way his gaze lingers on your body. You shake your head, biting back a smile as he extends his hand to you.
“I’d love one, but I do want to unpack.” You say, hesitating because you know what will happen if you’re alone with him again.
“No worries, I can help. Speed things along, you know.” Pietro isn’t pushy and instead of insisting, he simply picks you up bridal style and zips you to your new bedroom, dropping you onto your feet in the middle of the room before you’ve fully blinked.
“Okay, you’re just showing off.” You laugh and he just grins as he helps you unpack and get you settled in your bedroom.
In the following weeks, Pietro had less and less shame, he would walk around shirtless, pick you up and speed you away just to show you how quickly he could have you alone, tease you about your outfits in the morning. Your mom caught him sneaking out of your room once even though you hadn’t done anything except watch him go through your closet and answer his personal questions about your dating history. His dad caught him pinning you down on the couch in the living room after a playful fight over the remote nearly became more. Subtlety clearly wasn’t your brother’s strong suit.
It was a whirlwind having to be the rational one because while Pietro clearly didn’t see you as a sister, you still knew it wasn’t right. You were a rule follower through and through, a goody two-shoes even.
“Pietro, stop.” You scold quietly as you feel his hand on your thigh during dinner one night, brushing it off only for him to chuckle under his breath.
“It’s your fault, how is your skin so soft?” He whispers demandingly into your ear and you can’t help a soft laugh as it escapes you.
From the other side of the table, your mother smiles at the two of you and Erik squeezes her shoulder, noticing the same sibling bond forming in front of them. “It’s so nice to see the two of you have become friends.”
“Oh, it’s been great,” Pietro agrees, casually wrapping an arm around the back of your chair. “I think this is my second chance at being a better older brother. Didn’t quite get it right the first time.”
Your mom and Erik laugh at that and dinner resumes as if Pietro isn’t whispering inappropriate things to you. Your thighs squeeze together and you squirm slightly from his attention, and not because you don’t like it. A part of you knows this isn’t right, your parents are married, but a smaller part doesn’t fail to remind you that you’re not really related to begin with, not by blood.
It happens again one late night, the first time since the wedding when you cross the lines. You were munching on a granola bar and sipping some juice, wearing some sleep shorts and a crop top. You weren’t completely used to the nighttime noises around this new house, but you felt comfortable and safe. As you got lost in thought, the wind picked up and you turned to see Pietro strolling in, shirtless with that signature cocky smirk.
“Perfect, I was just looking for a midnight snack.” He grins like a predator, moving around the island and slowly caging you in a corner.
“Pietro,” You say with a warmth in your face that isn’t so much embarrassment anymore, but rather flattery. “You know you shouldn’t say things like that.”
“Why not?” He asks, taking your hand and lifting it to take the last bite from your bar. Fuck, stop staring at him, you think to yourself as he chews slowly, smiling at you in amusement. “You don’t like hearing how pretty you are, princess?”
Your words are caught in your throat, but you swallow them and try again. “It’s inappropriate. We’re siblings. My mom and your dad are married, remember?”
“Hard to forget when you keep reminding me,” Pietro says with an easy grin, one hand sliding around your waist and he leans down, his nose brushing your hairline as you shiver from the warmth of his body, his bare chest, so close. “But what if I told you I just don’t care?”
“You should.” You counter, looking up at him almost submissively and he gives you a noncommittal shrug.
With nothing left to say, you finally kiss him again. Pietro’s hands are cupping your face as he growls softly against your lips and you moan into the gesture. Without warning, he lifts you onto the counter and you moan as his tongue slips into your mouth all too easily. His hands are firm on your hips while you hold onto his shoulders, letting him step between your thighs as the kiss deepens. Your tongues are licking at each other’s mouths, hands groping and exploring as the kiss becomes a heated make out.
“Pi-Pietro, we gotta-mm-we gotta stop.” You say between kisses. Pietro moves his mouth down to kiss along your neck and you sigh as you let your head tilt back to give him more access. “Oh, please.”
“Fuck, I want you.” He groans, biting your bottom lip as his fingers curl into the hem of your sleep shirt, tugging desperately at the thin material and you almost let him pull it off until you hear footsteps coming towards the kitchen.
“Get off!” You whisper in urgency, pushing him away and hopping off the counter just as his dad walks into the kitchen.
Erik’s eyes catch his son’s cocky grin and his new stepdaughter’s flushed appearance as you fix your blouse. “Everything okay in here?” He asks, eyeing Pietro who gives him a small shrug and you quickly interject.
“Pietro was just helping me reach a glass.” You say as you set your empty glass in the sink and give Pietro a small nod. “Thanks.” You move past your step dad and give him a smile before chirping a too enthusiastic, “Goodnight!”
Erik and Pietro don’t move a muscle until your bedroom door is heard closing behind you upstairs, their eyes locked on one another as if waiting for the other to blink first. Erik takes a deep breath and sighs almost in annoyance.
“You better think about what you’re doing, son.”
“I’m not doing anything, old man.” Pietro says as he moves past his father with too much confidence only to be stopped with a firm hand on the shoulder and Erik squeezes warningly.
“Her mother means a lot to me, don’t go screwing around.”
That only made Pietro want to screw around more.
One afternoon, a few weeks later, you are reading in your bedroom which feels more and more yours, when Pietro comes in to bother you, fluster you, and you let him. “It must be exhausting to look this good all the time, huh?” He flirts, leaning against your doorframe and looking you over where you’re curled up in your bed.
“Stop it.” You laugh, blushing when he sprawls out at the end of your bed, an arm tucked behind his head, making his t-shirt ride up a little and expose the V cut in his hips and the happy trail disappearing underneath his waistband. “You know you’re not supposed to be in here. Your dad said.” You say in an attempt to deter him, and yourself.
“Yeah, he also said I’d be getting a little sister and he made it sound like you’d be a five year old, not this.” He says as he looks over you in that way that should make you uneasy, but lately just makes you hot.
“You need to behave.” You say with a of shake your head as you return to the book in your lap, chewing anxiously on your lip and hoping he doesn’t pull because you’ll follow.
Pietro sits up, his eyes on yours as he gently places a hand on your thigh. Your chest tightens and you give him a pleading look. “I’m serious, princess. You’re not what I was expecting, how am I supposed to behave around you?” He then crawls towards you, kissing you softly as you sigh and return the kiss, one hand coming up to rest on his jaw while he moves to lay on top of you.
“Just for a little bit.” You whisper, glancing at your bedroom door while Pietro takes your book out of your hands and pulls you fully underneath him by your thighs.
Your legs part as he settles between them and your hands tangle in his messy, silver hair as he kisses you hungrily and intentionally. You have to keep your focus not only on his mouth, but his hands because you know for sure they could make quick work of your clothes before you blink. His hands explore the shape of your body, kneading your breasts and ass while you let yourself trace the muscles on his back and the test the strength in his arms with a squeeze.
“Let me taste it?” He asks with a cheeky grin as you pull apart to take a breath and you bite your lip, nervously shaking your head.
“We’ll get caught.” You whisper, glancing back over at your bedroom door.
“They’re not even here.” Pietro counters, already kissing down your neck and sternum. “C’mon, it’ll feel so good.”
Your mind is spiraling from the sensation of his hands pulling your shorts and panties down, his mouth latches to your neck as his fingers prod at your folds. “Oh, my god.” You gasp softly as his digits slide between your legs, exploring and coaxing reactions from you that seem to fuel his bad idea.
“Told you, feels good, huh?” Pietro murmurs with a cocky grin that makes you roll your eyes playfully as he moves down to settle his head between your thighs. “Fuck, you smell so good.” He groans, inhaling your scent which makes your face burn. His tongue parts your folds, flicking your clit and making your back arch against the bed. Your hand finds his hair and the other fists the sheets as his tongue burrows into you, his thumb rubbing on your clit until you’re trembling with an impending release.
“You shouldn’t be good at this.” You moan, watching him eat you out with greed, fingers playing with your clit and spreading your folds so he can get a good look at you which just makes you all the more shy.
“No,” He groans, lapping like a parched man at your leaking core. “I shouldn’t be good at this with you.”Pietro suddenly stops to remove your t-shirt and you whine quietly, your hips lifting towards him which makes him chuckle as he shoves his sweats down.
“Wait, no, we can’t do that.” You say, placing your hand against his bare chest to stop him.
“Just the tip, I promise,” Pietro counters, taking your hand and kissing your palm before leaning down and kissing your lips. “I’ll stop if you don’t like it.”
You bite your lip and then nod slowly, watching him closely as he lines his tip to your wet core. “Go slow.” You whisper, watching with wide eyes as his tip parts you, making you stretch around him and you moan quietly, clutching absentmindedly to his forearms as he fucks you with his tip.
“You know,” Pietro says, panting softly as he fists his length to keep himself accountable, dipping into your opening again and again with an increasingly wet squelch that makes your shiver. “This doesn’t really count, we’re not going all the way.”
“That’s good,” You say, not really listening as you are too consumed by the pleasure and the adrenaline from having your step brother between your thighs in your bedroom. You are squirming and moaning as his tip brushes against your clit before slipping back inside you. “It’s so good, oh, fuck.” Pietro taps his heavy cock against your bud and you whine, looking up at him and biting your lip with want and hesitation.
“You want more, sis?” He asks so casually, so cheekily, it makes your belly flip because you shouldn’t be turned on by the way he asks, but you are.
“Yes, please, just fuck me.”
With that permission, Pietro sinks into you and you inhale sharply from the stretch and the way he fills you completely. “Fuck, baby,” Pietro groans, burying his face in your neck as his hips pick up speed and his cock slides all too easily, coated in a creamy sheen of your arousal while your scratch at his back. “Take it, just keep taking it, you feel so fucking good.” He growls, his fingers digging into your hips.
“Oh, Pietro! I’m gonna cum. Please, please, please!” You cry out, clinging to him as his arms wrap around you and he holds you flush to his body while he fucks himself into you. Your breasts bounce with each thrust and Pietro’s mouthing and sucking on them while getting lost in the way you clench and gush around his girth. Your release then crashes over you like a wave and you tremble in his arms as Pietro chases his own pleasure. “N-Not inside.” You manage while dazed and blissed out from the way his length keeps pounding into you.
“Shit,” Pietro suddenly pulls out and his cum spurts onto your stomach, groaning and doubling over as he jerks off on you. You’re panting beneath him, watching as he strokes his length and drips onto you before he suddenly lines himself back up. Still hard, still aching for more.
“Our parents will be home soon.” You try breathlessly, pushing weakly on his chest as he slides back in and you mewl softly, already arching for him again as he fills you completely.
“Fuck, that was so good. We gotta do it again.” He says, the strokes of his cock stretch and gradually increase in speed, making your eyes roll back as the pleasure and overstimulation consume you. “You like this, princess?” He asks with a nip at your lip while you nod along to his filthy words. “Like how big brother fucks you while mom and dad are gone?”
“Yes, yes, Pietro, it feels so good.” You cry softly, clinging to him as he keeps a steady pace that makes your toes curl and your head loll around from being so dazed. “Don’t stop, please.”
At this point, you don’t care that it’s wrong, you don’t care that you might get caught. Pietro’s not your real brother anyway, just a really good looking roommate if you think about it, and you try not to while he’s still in you.
Families are all different, and this one is yours now.
I hope everyone has a happy thanksgiving!🍁 🦃
I will be traveling for the holiday, but I just wanted to drop this off for the freaky girls, like myself, who love Pietro💙🩶
Quicksilver Masterlist
