Not The Stepsister - Blog Posts

unironically want that mediocre gfs w u stuck and just the 'nat 😳😳😳what r u doing'

you know. you know what. i make myself laugh. thats what matters.

title: you dirty, dirty girl

summary:

Nat chuckles. Her hands, calloused and hot, squeeze your cheeks. Spread them. Her mouth hovers over your tailbone. “Seriously? You got yourself stuck in the laundry machine in this get-up?”

“It was not on purpose. Pull that back up, so help me-”

content: nat/f!reader, dom/sub, cum filled strap, anal, anal plug

(ao3)

Fate is cruel. So very cruel. You have never wanted to die this badly.

For over ten minutes—you can tell based on the number of songs that have played, you have been stuck in your laundry machine. In your fucking underwear like some lousy porn. What’s worse is that you decided that today of all days, you would invite Nat over. Nat, who only ever takes two-hour naps at most and went to sleep on your couch an hour and a half ago. Nat, who will laugh so hard she dies from oxygen deprivation when she sees you. And then you will die because you’re stuck in a laundry machine with no possible escape.

At least you’ll die next to each other. How romantic.

Picture this: blades at the inside of the laundry machine, cut up into strings. What bliss.

You stick your forearm into your mouth for the third time so far so you can muffle your scream of pure frustration. You will not be surprised at all if you lose your voice tomorrow.

It all started because of Nat’s stupid fucking sock. She’s always complaining that your laundry machine eats her socks, so you’d made sure to fish them all out. Except when you tried to grab the last one (patterned with cartoon spiders hanging off a faucet—a gag gift you got her for her birthday), you had leaned too far in and now you couldn’t squeeze your shoulders back out.

How does this happen in real life?

The rim of the laundry machine is starting to bite. You smack the inside of the machine with your fist, kicking your legs out. Another infuriated cry into your forearm.

Another song begins playing. You hate this song.

You close your eyes, feeling your head throb, and then suck in a deep, long breath. The air is humid, disgustingly so.

It’s time.

It’s time to suck it up.

You prepare a lungful of air, and— you screech.

Thud!

“Fuck!” comes Nat’s sleep-raspy voice.

That felt good. You scream again, making sure there’s a real guttural note to it.

“Baby?” Nat yells, confused, slightly panicked. Rapid footsteps. The door swings open. “Are you okay?”

“Get me out,” you grit lowly.

She doesn’t react immediately. You imagine she didn’t hear; she’s taking it all in. Maybe, she’s still rubbing her ass from falling off the couch. Then: “…what the hell.”

“Natasha.” Your knuckles blanche with how tight your fists are clenched. You speak louder, enunciating: “Get. Me. Out.”

A warm hand on your lower back, where your spaghetti top has ridden up. The music from your phone pauses, and Nat crouches next to you. “Is there a spider in there or something? I told you I’m not going to kill spiders for you. The joke is old.”

“I am not.” You inhale. Hold. Exhale. “I am not fucking joking right now, Natasha fucking Romanoff, if you do not get me out of here-”

“You’re really not funny. You’re not.” Nat pokes your ass cheek. “I could be sleeping right now.”

“Natasha!” you screech, thrashing your lower body. “I’m fucking stuck in the laundry machine! Get me out. Get me out!”

Another lengthy pause. Nat puts both hands on your back and leans down, presumably to peek into the laundry machine because she’s an asshole who doesn’t believe you. Which is just so—

“Annoying piece of shit! Fucking-” You slam your palms down, metallic clanging grating against your ears. You feel like a child throwing a temper tantrum.

“For real? For real, dude. You’re…” Nat presses closer and breathes down your neck. So not helping. “…wow.”

“I will break up with you.”

“But…”

“Don’t.”

“But step-sister-”

“Natasha,” you grind out between your teeth.

Her body warmth withdraws, and you sigh in relief. Then, she hooks her fingers into your panties and slides them down to your knees.

“I will kill you. I will kill you. I will kill you.”

Nat chuckles. Her hands, calloused and hot, squeeze your cheeks. Spread them. Her mouth hovers over your tailbone. “Seriously? You got yourself stuck in the laundry machine in this get-up?”

“It was not on purpose. Pull that back up, so help me-”

“I don’t believe you.” She removes a hand. Only to bring it back down in a spank.

You yelp, flushing deeply, abruptly. “I don’t care,” your voice hikes up a pitch on another spank, “Nat, please.”

“That’s more like it,” she husks, breath fanning across your back. “Begging.”

It must be a Pavlovian response to that specific tone of voice. No other explanation for why you’re moments from getting wet. You did not do this on purpose.

Nat noses along the curve of your ass. You feel her lips curve into a smile; you can just picture it: impish, cocky, shit-eating. She digs her nails into your stinging ass cheek, bites the other one, and gives it another harsh smack.

The ass bad airflow in the drum must be fucking with your head. You bite your lip to prevent a whimper from escaping. To your great shame, you feel arousal gush out. Perhaps Nat won’t notice immediately, so you have time to brace yourself for the incoming humiliation.

Nat leaves a wet mark on your ass, and it prickles on your skin as it dries in the air. She sighs very contently, and you know, at that moment, the game is over.

“Sweetheart, do you want to safeword?” You slot your teeth into the bitemark on your arm and groan into it. Her hand rubs your smarting cheek as if to console you. She’s unbearably smug when she says: “I didn’t think so.”

You move your arm to your forehead, leaning heavily onto it. This is happening. It would be fantastic if those blades appeared now.

To your horror, Nat pulls away entirely and takes a few steps back.

You make a noise of alarm, body taut like a bowstring. “Don’t leave me here. Nat, please, don’t. Please.”

Footsteps returning. Hand patting your spine. “Just for a minute, okay? I’ll be quick.”

“Promise?” you whisper, afraid for a second that she won’t hear.

But she pats you again and says, “Promise, sweet girl. Be good.”

And she’s gone for ages.

The embarrassment from this whole situation makes you heat up, makes you tense, makes you wet, and the latter makes the humiliation greater. It’s a vicious cycle. You’re definitely not thinking clearly anymore, pulled into that happy, fuzzy space where anything Nat does gets you off. Where time moves nonlinearly.

You sigh, biting your lip and waggling your foot as you wait for her. It feels like too long, but you can’t trust your sense of time, and you can’t trust Nat to not take forever just to fuck with you. But she did promise—she doesn’t usually break promises like this.

“Nat?” you ask, voice meek. Pathetic.

No response.

You brace your hands on the end of the drum and push. No go. Still.

Unfortunately, this is when Nat decides to come back. Pitter-patter of her feet incoming fast. You knew she wouldn’t lie. She wasn’t trying to drag it out—

“Well, well.” Nat stops at the door. “I was going to be nice, you know?”

You drop your arms with a sad moan. “You were gone.”

“Good girls are patient.” Her voice comes closer. “Good girls get their pussies filled.”

“Please.” You practically claw your way deeper into the machine in an attempt to appease her.

She tsks, and her hands grip you by the hips, pulling you back in place. “Hold still now. I’ll fuck you if you listen.”

“Okay,” you eventually mutter.

Nat hums. You hear clinking and rustling. She’s tampering with something. You wish you could twist around and see her, gauge her mood. Alas, the tight space does you no favours.

Anyway, you did agree to hold still, didn’t you?

For a long time, nothing happens. This time, you’re sure Nat’s fucking with you, but you don’t know what to do to get her moving. Your slick is trickling down your thighs now. The odds are stacked against you.

“Nat, please,” you whine.

A huff. “That was your second chance.” She’s still not touching you. You curl your toes, tensing up. “How many spanks for the impatience?”

“…um, five?” you attempt.

“We’ll do five times the number I was thinking. Better luck next time.” Her palm comes down out of nowhere and with a punishing force. You cry out, trying to twist into the drum. She just drags you back out. “Count for me. No mistakes, and I’ll halve the number.”

Were you not so horny, you would’ve asked her why she’s acting like a primary school math teacher. Instead, you choke out: “One.”

She hums and hits at your thigh this time. You wriggle, count, and she resituates you. Repeat. The spanks land along your ass and thighs, and, every so often, she pauses to massage your stinging flesh. By the time she hits twenty, you’re a snivelling mess.

She shushes you, squeezing a hand through to rub circles between your shoulder blades. “Five more, okay?”

You nod, though she might not see it. Still, she takes it as a go-ahead to give you five more swats, alternating spots with each one. You spit out the last five numbers in quick succession, voice small and wobbly.

Nat squats low to kiss at your tender skin, murmuring praise and encouragements to you until you sigh. “I’m okay now. Mostly.”

Her hand rests gently on a bruise. “Mostly?”

You nod again, head drooped into a pile of your arms. “Yeah. Green.”

A thoughtful hum. Then, she’s gone, and there’s the pop of a cap being opened. “Relax for me, sweetheart.”

With a keen, you do your best to slacken. Even then, when cold fingers touch your still sensitive ass, you jolt and hiss.

“Sorry, baby,” Nat soothes. Gingerly, she tugs you open. “Come on. Deep breaths. You know how prep goes.”

You do. Your clit throbs.

You do as you’re told, trying to count out each breath. You begin to appreciate her cool touch, overheated as you are.

When she’s deemed you sufficiently calm, she presses her lubed thumb against the ring of your ass and makes tiny circles on it. Your cunt clenches in anticipation.

“You’re my good girl,” she coos, ghosting her other hand along your inner thigh. “My baby. Good little slut for me, hm?”

Tiny: “Mhm.”

Nat rewards you with the first knuckle of her index finger. You gasp, and she cuts it off with one of her own. “No matter how many times I fuck you, you’re still this tight,” she says, almost like she’s musing to herself. Another press of her lips to your ass, then she pushes her finger all the way in. “So good for me.”

Yes. Good. You nod, eyes clenched shut.

Before she slips her second finger in, she gives you a few thrusts that have you groaning and dropping heavily into the laundry machine. Nat’s patient with you, waiting for you to settle back down before pistoning both fingers into you. Once, twice, three times.

She scissors her fingers, curls them, twists them. Each time, you try not to writhe. Your earlier screeching has your throat too raw to make sounds louder than a breathy wail, so you’re left whimpering and heaving for breath.

Overlaying all of this is Nat’s filthy whispers. She calls you good, her precious baby. Yet, every time your cunt leaks more arousal, or it clenches on nothing, or your sphincter spasms around her fingers, she’s groaning out greedy whore, aching for cock. Your head spins from it all.

After an age, she drags her fingers out of you with a sound that verges on forlorn.

“I’m fucking you ‘till I’m bored,” she informs you.

“Please, please, please,” is all you can say.

She laughs, probing at your asshole with the head of her strap-on, and you’re instantly babbling out pitiful sounds, and she just laughs a bit more. Your arms are damaged from how hard you grip onto them, from the occasional snap of your jaw around them.

The cock splits you open slowly, rubs against your hypersensitive skin, and you hiccup midway through a cry. Nat stops when she bottoms out, cursing under her breath at the sight of your ass wrapped tight around the girth of her piece.

Then, the sound of a shutter.

Your sound of confusion sounds like a mewl.

“Don’t think,” she says lightly, jerking her hips into a grind, “just take it.”

Your lungs run ragged, trying to take in enough air for your brain.

She strokes over your waist, down your thigh, and exhales softly. Pulls out halfway and drives the cock back in. “Oh, sweetheart,” she sighs. “Yes. Just take it.”

“Yes,” you echo, eyebrows crinkling as she starts up a snappy pace, “yes, yes, yes-”

The fit is tight, excruciating in its pleasure. The friction of your muscles around her girth has you drooling on your arm, mouth slack and open.

After a particularly loud whimper, Nat plants a hand on your back and presses you into the rim of the machine. With the leverage, she can fuck into you harder, faster. Her other hand flits around your body and slithers down your navel to cup your mound.

You buck down into her hand.

“Stay,” she barks. With her assistance, you’re returned to your previous height, much to your chagrin.

“Please,” you moan brokenly, “Nat, please.”

She pinches your ass, ignoring your mournful yowl. Somehow, she fucks you harder, your bodies swaying forward with every shove. The ache, the sound, of her front meeting your backside has you needier. Somehow, needier.

So full. Alight with sensation. Just not where you need it.

Nat takes pity. She reaches around and, this time, sweeps the pad of her finger over your clit.

You wail.

The finger draws tight circles around your clit, pressure becoming more deliberate, harsher, as your cries escalate into—nothing.

Your mouth falls open silently, overworked throat failing at producing noise.

And you’re full—so full—more full. Nat releases into you with a grunt, a gasp, and then a long groan. Fingers splayed out on your back, the other hand slipping away from your dripping cunt.

Fake cum pools heavy inside you, fucked deep inside you by the strap that Nat keeps pushing into you.

Afterwards, she drapes her body over yours with a puff of breath.

“Thank you,” you mumble eventually.

She barks a laugh. It’s a cute sound, you hate to admit. “You’re welcome for using you as a fleshlight.”

You manage a smile. “Any time.”

Another exhale as she hikes herself up using the edge of the machine and inches her cock out of you. She hums in sympathy with your quickened breathing.

You make to wiggle out after, but she stills you with a hand.

“What’s the rush, baby?” There’s a hint of mirth in her voice that you don’t trust at all. A very familiar click of shutters. “Look at you, gaping for me. Leaking for me.” Her thumb whips out to catch the cum dribbling out, pushes it back in. “Better not waste, though.”

Your clit throbs with your pulse. “…Nat.”

“What?” But she doesn’t give you a chance to continue, bulldozing on: “You know, honey, the absence of your humongous mommy kink has been quite disappointing.”

“My god.”

“Laundry machine? Anal? Coming inside? Check, check, and check. Weird familial-”

“Please stop.” Your temple throbs with your pulse.

Nat’s laugh, cackle, really, is much less charming this time around. “Hold onto this for me, will you?” she basically croons. And then she sets the tip of what you assume is a plug at your asshole. “Anyway, don’t act like you don’t love this whore that you are.”

“Nat,” you whine, but then you stop because you can’t deny her. She makes a point of holding the plug in your ass at its widest point and then releasing it, enjoying the view of your ass swallowing it.

“Greedy little hole,” she notes. Then, she claps her hands together, makes a sound like she’s dusting them off, and gets up. “Well, that was fun- Oh, you didn’t start the dryer.”

“You- Nat, you’re not leaving me-”

“Sure am.” Beep. Beep-beep. The dryer starts loudly. Obnoxiously. Nat’s shadow passes over you, and then there’s the sound again, of camera shutters. “These are great. Can’t believe this is real life. Can you?”

“Nat! You are not leaving me here!”

“Thanks for letting me borrow your phone. Let me just send that over to myself…” The fact that she used your own goddamn phone to get a picture for this really drives the shame home. “Anyway, see you when the dryer’s done.”

Footsteps receding.

You shriek, shrill. Your ass closes tight around the plug, around the cum inside you, and you feel how utterly soaked your lower half is. And your upper half, from the laundry water.

“We’re fucking over!”

Nat’s laugh rings through the house.