Impossible to stay away

You barely make it through the morning.

Just the knowledge that you’re going to see Sandra between classes has you half-hard for hours. Every time your mind drifts you remember the way her pussy felt locked around you, the way she held you against her cervix while you came, the way she looked when you left her naked and leaking in the doorway. By the time the lecture ends you’re already breathing a little too hard.

You spot her the second you step into the hallway.

Sandra is waiting near the stairwell, backpack slung over one shoulder, trying (and failing) to look normal. The second your eyes meet, her cheeks flush dark. You can see her breathing pick up from here. She’s wearing a loose crop top and a short skirt that shouldn’t be allowed to look that good on her. When she shifts her weight you catch the faintest press of her thighs together.

Neither of you says hello properly.

You’re both already panting by the time you’re close enough to speak.

“Rooftop,”
she whispers, voice rough.
“Now. We’re skipping.”

You don’t argue.

The rooftop door is supposed to be locked, but Sandra has known how to jiggle it open since first year. The second it closes behind you she’s on you—mouth crashing into yours, hands already under your shirt, grinding against the hard bulge in your jeans. You shove her back against the concrete wall beside the stairwell housing, out of sight of any windows. Her skirt is rucked up in seconds. She’s not wearing panties.

And she’s soaked.

You free your cock, hitch one of her strong legs over your hip, and push into her in one deep, greedy thrust. Sandra’s head tips back against the wall with a broken moan she tries to muffle against your shoulder. Her pussy is just as perfect as yesterday—hot, dripping, still a little soft and used from everything you did to her, but gripping you like it never wants to let go.

You fuck her hard and fast against the wall, the way two people do when they only have a short break and can’t stand another second without being inside each other. Her crop top is shoved up so her heavy tits bounce freely with every thrust. One of your hands stays locked on her ass, keeping her open and tilted so you can drive as deep as possible. The wet slap of skin and her stifled moans are the only sounds on the empty rooftop.

“Bestie,” she gasps between thrusts, the words completely destroyed by how desperately she’s clinging to you.
“fuck, John, harder—fill me again before next class—”

You’re both already close. The compatibility is ridiculous; your bodies lock together like they were built for this exact purpose. When you finally bury yourself to the hilt and start pumping her full she comes with you, thighs shaking, pussy milking every pulse while she bites down on your shoulder to stay quiet.

You stay inside her for a long moment after, both of you panting, foreheads pressed together. Cum is already starting to leak out around your cock and drip onto the concrete between her feet.

Sandra’s voice is small and wrecked when she finally speaks.

“…We should… probably go to the next class.”

She doesn’t move to let you pull out.

You make it maybe two inches before the feel of her wet, cum-slick walls dragging along your cock destroys whatever willpower you had left. Sandra feels it too—her leg tightens around your hip and she pulls you straight back in with a shaky, desperate sound.

You start fucking her again in earnest.

The next lecture comes and goes while you’re still buried inside her against the rooftop wall. Neither of you cares. The sun is warm on your skin, the city noise is distant, and the only thing that exists is the wet, perfect heat of her pussy and the way she keeps clenching every time you bottom out against her cervix. You trade places at some point—her hands braced on the low wall, ass pushed out, you railing her from behind while her heavy tits swing freely. Then she’s back in your arms, one leg hitched high, kissing you messily the entire time you grind deep and fill her a second time.

Your bodies are ridiculous together. Every time one of you starts to soften the other only has to shift or clench or kiss a certain way and you’re both hard and dripping again within a minute. Hormones are flooding so hard it almost feels dangerous—like if you stayed joined long enough you’d actually fuse.

By the time the second lecture would have ended you’re both wrecked and sticky. You’re still inside her, slower now, just rocking together while cum from the last two loads slowly leaks out around your shaft and drips onto the concrete.

Sandra’s forehead rests against yours. She’s breathing hard. Her voice comes out quiet and careful, the friends-with-benefits mask firmly back in place even while you’re balls-deep in her.

“…We’re going to have to think about contraception soon.”

She swallows. Her pussy gives a small, involuntary flutter around you at the word.

“I mean… properly. If we keep doing this every day like this.”
Her hips give the tiniest roll, like she can’t help it.
“Pregnancy would… complicate the benefits thing. A lot. And I don’t want to stop. But I also really don’t want anything between us. Condoms feel wrong after how we’ve been.”

She doesn’t say the rest out loud:

That she doesn’t actually want contraception at all.

That the thought of you knocking her up makes her clench and drip even more.

That the breeding kink she discovered yesterday is already louder than her fear.

That she’s terrified pregnancy would force the real feelings into the open and risk losing you.

Instead she just keeps slowly rocking on your cock, voice soft and practical, trying to sound like a responsible friend-with-benefits instead of a girl who wants her womb claimed.

you agree out loud.

“Yeah. Pill’s smart. Go see the doctor as soon as you can. We don’t want to risk anything that forces us to stop.”

Your body does the exact opposite of your words.

The second the agreement leaves your mouth you start fucking her deeper again—slow, heavy, deliberate strokes that keep the head of your cock pressed against her cervix like you’re trying to force one more load straight into her womb before the chance disappears. Sandra feels it. Her breath hitches and her walls flutter hard around you, but she doesn’t stop you. She just wraps her arms tighter around your neck and takes it, moaning softly into your shoulder while you try to breed her in earnest one last time on the rooftop.

She comes again from the intensity of it, quiet and shaky, and the way her pussy milks you pulls a thick third load out of you before you can stop yourself. You stay buried through the whole thing, grinding against her cervix until the last pulse fades.

Only then do you finally separate, both of you sticky and panting.

Sandra fixes her skirt with trembling hands. Her crop top is still half-rucked up. Cum is already running down her thighs in heavy white streaks. She looks thoroughly claimed and still hungry.

“I’ll call the clinic today,”
she says, voice rough but determined.
“Get on the pill as fast as possible. I don’t want us having to pull back or use anything even for a week. I just… need to keep doing this with you.”

You both know what she’s really saying.

You split up for the rest of the day, bodies still thrumming. The plan is simple: meet at her place later tonight. Her parents are currently home, which means you’ll have to be careful—quiet, clothed, no obvious signs of what you’ve been doing. But tomorrow they leave for a two-week vacation.

The moment that fact settles between you, something feral and mutual lights up in both your chests.

Two full weeks. Empty house. No interruptions. No parents. No classes you can’t skip. Just the two of you, the bed, and every single load you can pump into her while the pill is still kicking in (or before it fully does).

You’re both already salivating over it as you part ways in the hallway—eyes lingering too long, bodies reluctant to step apart.

Sandra’s last quiet words before she turns the corner are almost a promise:

“Tomorrow night… once they’re gone… come over and stay. We’ll have the whole place to ourselves. Just friends with benefits. Taking care of each other. A lot.”

Her thighs press together one more time, and you know she’s already thinking about how many times you’re going to fill her once the door locks behind her parents.