Stay quiet, but start jerking

The view was incredible… even as she put her panties on, that silky thong was wedged right up her ass cheeks giving him a spectacular view. She had picked out a white bra but unaware of her bedroom audience, she had it dangling from her fingertips as she moved around the room, no rush to cover her perky breasts.

Unable to resist any longer, Ryan's hand creeps into his swim trunks, his fingers wrapping around his throbbing cock. He bites his lip to stifle a groan as he starts to stroke himself, his eyes never leaving Luna's near naked form.

She's moving around the room, oblivious to his presence. The blonde bends over to pick up her discarded towel, giving Ryan a perfect view of her ass. He can see the globes of her cheeks, the way they jiggle slightly with her movement.

Ryan pumps his cock faster, his breath coming in short, sharp gasps. He knows he shouldn't be doing this, knows that if Luna catches him, it will be the end of everything. But he can't seem to stop, can't seem to tear his eyes away from her.

Luna straightens up, turning to face the closet. For a moment, Ryan's heart stops, sure that she's seen him. But she just sighs, running a hand through her damp hair.

"Fucking Ryan," she mutters, her voice filled with frustration. "Always causing trouble."

Ryan's heart races at her words, a mix of guilt and excitement coursing through him. He knows he should feel bad, should feel ashamed of what he's doing. But all he can feel is a ****, aching need. He strokes himself harder, his hips bucking into his hand. He's close, so close. Just a little more...

Suddenly, Luna's phone rings, the sound loud in the quiet room. She moves to answer it, her back turned to the closet once more.

Ryan can't hear exactly what she's saying, but he can see the way her body moves, the way her hips sway as she talks. He still has his hand on his cock, it’s throbbing in his hand, his balls tight and heavy. He can feel the pressure building, the heat coiling in his gut.

Luna turns away from him again, her back to the closet as she continues her conversation. Ryan takes the opportunity to stroke himself faster, his hand a blur over his shaft.

He's imagining it's Luna's hand on him, her soft skin gliding over his hard length. He pictures her on her knees in front of him, her mouth open and waiting. He can almost feel her lips wrapped around him, her tongue swirling around the head of his cock.

Ryan's breathing is ragged, his hips thrusting into his fist. He's right on the edge, teetering on the brink of release. All he needs is a little more...

Suddenly, Luna's phone slips from her hand, clattering to the floor. She bends down to pick it up, her ass pointing directly at the closet. Ryan's eyes widen, his cock pulsing in his hand.

It’s one hell of a view, even with her thong on, the way her cheeks part, the way her pussy standouts under the fabric. He can almost taste her scent on his tongue.

With a muffled groan, Ryan comes, his orgasm hitting him like a freight train. His cock jerks in his hand, his cum spurting out in thick, hot ropes. He bites down on his fist, trying to stifle his moans as he rides out the waves of pleasure.

As he starts to come down, reality crashes over him. What the fuck has he done? He's just jerked off to his stepsister, hidden in her closet like some kind of pervert. He's fucked up, royally fucked up.