Getting rid of a week's worth of sexual frustration

"Although" she started, a naughty smirk slowly creeping across her lips, "maybe I should wait before putting these on."

Catching her meaning, Josh returned her smile and threw his phone on the side table. At that Monica jumped onto the mattress, her panties falling forgotten back behind her. At the moment, she didn't care she'd have to find them again.

She threw the covers across the bed as she landed, revealing Josh's lower half as he struggled with the few last remaining buttons on his shorts. He kicked madly to get them off, exposing a cock that was quickly growing with arousal.

Monica literally purred as she saw it, the girl staring at his dick with a look of pure admiration. It was raw lust; the kind he'd never seen from Julie or any previous girlfriend. Monica, it seemed, was an entirely different animal. It was evident that she absolutely loved sex.

"God you look beautiful." She said to his dick, straddling him so that his dick rose up beneath her.

Normally his ego would have caused him to grin and give a snarky response in return. Instead, he was stunned silent as Monica's pussy was exposed to him for the very first time, all words and thoughts leaving him as he stared between his sister's legs.

In a word, it was perfect. Her mound was hairless, giving him an unobstructed view of the hidden treasure all girls kept to themselves. Her pussy itself was pink, puffy, and wet, her lips parting beautifully as they shined brightly with arousal, proving to him that she was just as excited for this as he was. Even her clit, normally hiding deep inside its hood, was peeking out and hard, begging for attention. Somehow, Monica's pussy looked both innocent and naughty, a strange mix that made his throb in excitement. The fact it was his sister was the cherry on top.

"You like?" she teased, having noticed where his eyes were locked. "I just finished shaving her." She said without shame, rubbing two fingers across her folds. They shined with the juices she was producing. "I know you like her nice and smooth."

Fuck, Monica was twice the girlfriend Julie ever was.

Josh couldn't help it - he stared at his sister's shaven pussy as it dripped just inches above his cock. Never had he been this hard. But he couldn't move, his body mesmerized by the forbidden fruit he'd never been allowed to see, let alone fuck. He watched her fingers trace circles around her clit, causing her hips to buckle slightly in pleasure.

When they'd been sufficiently coated, she reached down, his resulting groan loud and deep when she grabbed him. She moved her hand across his shaft, spreading her arousal across his, lubing him for the main event. He simply moaned, paralyzed by his sister's actions.

"Fuck, I love the power I have over you when I do this." She admitted with a smirk, her voice flushed with need. "It makes me so fucking wet seeing you so powerless. So under my control."

She wasn't kidding, the girl was soaked. He knew because she'd lifted his cock, rubbing the tip of it against her pussy lips, lubing him further. The was barely any friction, his cock sliding across her folds like butter.

"This however, is the best part."

And she sighed, her body sliding down, her face scrunching in wordless pleasure as her pussy engulfed him. He slid in effortlessly, stretching her wet walls with his hardness. When he bottomed out, she slowly collapsed on top of him, cooing softly.

Josh didn't even try to speak. His body moved by instinct, grabbing both globes of her ass and pushing her down, gently thrusting his hips upwards in order to ensure every inch of him was buried within his sister. The siblings stayed motionless for a few passing seconds, enjoying the sensations their coupling was providing; him the warmth of being enveloped by pussy, her the bliss of being filled with dick.

"Fuck!" He eventually said. "You're tight."

"Yeah, I'll bet!" She replied, slowly lifting herself as she got ready to fuck him. He groaned as he felt her pussy slide across his cock, the feeling of her tightness leaving him until only his tip remained in her. His cock shined with her juices.

"I swear Josh you've never been this hard before."

"It's because I can't believe I'm doing this" he groaned as Monica landed on his groin, the **** of her thrust burying his cock balls deep into her wet folds.

"Doing what?" she inquires in return, quickly raising her hips as she rode Josh's prick like a stallion.

"Fucking my sister!" He replied as she came back down, grabbing her hips to hold her in place. The pleasure coursing through him made his cock throb inside her, their bodies locked together, neither moving, for a few glorious seconds.

"What's special about that?" she asked, bringing his hands down as she continued to fuck him. They fell onto the mattress as he let her guide their fuck, her body moving in familiar ways that allowed her to pleasure the both of them to the best of her abilities. "We started fucking long before you and I were dating, remember?"

He didn't reply, too busy being lost in the vision that was his sister. Monica had transformed into a creature of pure beauty and sex, her large tits bouncing in time with each thrust, her muscles taut as she moved, hair billowing wildly behind her. He couldn't believe how lucky he was to be fucking someone so undeniably sexy.

"Heck, I was what, fourteen, when you first taught me about sex? This isn't anything abnormal."

"Huh, that's fair." he finished, dismissing the conversation. As Monica did the bulk of the work, Josh, not having enough experience with the position to know how to properly enhance both of their pleasure, let his mind wonder back to the app that made brought this reality into existence. While miraculous, it sucked that the app didn't create new memories with each change he made; he'd have loved to know the new history he shared with Monica. Asking her about it would most likely result in more questions than answer. After all, what girl would enjoy reiterating the entirety of her relationship when her boyfriend claimed to not remember any of it? Best avoid that.

Unless there was a way of changing that. Maybe make it so that the app generated new memories with each change? Alternatively, he could rig it so that he never remembered the change at all. That option was risky though. He could always-

"You're being too passive." Monica suddenly said, bringing him out of his reverie. He shifted his gaze from her breasts to her eyes, and caught her as she grinned, still riding proudly on top of him.

"What?" he asked, stunned as his sister suddenly moved, shifting her body so that she rolled next to him. The motion sent him spiraling on top of her, switching their positions instantly.

"Your turn to fuck me!" she squealed, nuzzling herself beneath him, the pair suddenly finding themselves fucking in missionary.

His grin now matching hers, he happily obliged, thrusting back and pounding deeply into her soaked cunt. The resulting action shook the bed, Monica yelling in pleasure as she suddenly found herself forcefully filled with brotherly dick.

"God yes, that's what I needed. Fuck me hard, just like that!"

And Josh, who, in his mind, was fucking his sister for the very first time, did exactly that. One hand grabbed her swaying tit while the other grabbed her leg, simultaneously spreading her wider while solidifying his balance, he made it his mission to destroy her pussy. He fucked her hard and good, the smack of his balls on her ass joining the cacophony of moans the duo were producing as they rutted like animals.

As he pounded into her, Josh soon felt that familiar pressure slowly build within his loins. And... something new? It was like a dam, a wall slowly growing in strength within him, trying to hold something back. It wasn't his orgasm, it was distinct - something separate, yet inexplicably tied to his eventual orgasm. Two forces, one designed to release while the other was built to contain.

Josh knew, instinctively, that one could explode without the other. He could rapture in orgasm and keep the dam intact through sheer **** of will. How he knew this, he couldn't say.

But as the pleasure consumed him and his orgasm started, he ignore all thoughts of this new sensation and lost himself in what was familiar. He buried himself into Monica, sending his shaft balls deep as he groaned, his body quivering as it shook with the **** of his orgasm. Beneath him, his sister joined him in bliss, her own orgasm being triggered by his, resulting in her pussy rippling around his cock, squeezing the length of his shaft as he pulsed.