Strap on training...

You whimper as she forces you onto your back, your legs splayed open in a lewd display. The fake cock dangles obscenely from her groin, the bulbous head already slick with lube. She's going to fuck you. Ruin you with her strap on until it's all you can think about.

"Relax," she coos mockingly, pressing the tip against your quivering hole. "Or it'll hurt. A lot."

You try to obey, your body going slack against the bed. She breaches you with agonizing slowness, your rim stretching around the intruder. It aches, a sharp burning as she sinks into your depths. But then your walls flutter and clench, massaging the thick shaft.

She groans, a guttural sound that makes your spent cock twitch. "Fuck, you were made for this, sissy. Such a good little cock sleeve."

Your face burns at the crude words, even as your hips cant towards her, silently pleading for more. She obliges, withdrawing until just the tip remains before slamming home again. You wail, back arching off the bed. She sets a brutal pace, using you like a disposable toy.

The obscene slap of flesh on flesh echoes through the room, punctuated by your pitiful mewls. Tears stream down your cheeks, but she's relentless, pumping in and out of your abused hole. "Look at you, taking it so well," she pants. "I think you need this. Need to be filled and stretched and used."

You can only sob in response, lost to the overwhelming pleasure-pain. Her balls smack against your ass with each merciless thrust and you clench, **** for more.

"Beg for it," she hisses, sweat beading on her upper lip. "Beg me to fuck you, sissy. Beg me to ruin your hole and make you my cock-addicted whore."

"Please." you babble, dignity in tatters. "Please fuck me, mistress! Use me, break me, turn me into your dick-whore. Ruin me, please."

With a triumphant cry, she hilts inside you, flooding your guts with cum. You shake and twitch beneath her, milking her dry. You're a fuck toy. Her fuck toy. And you love it. Need it.

When you finally come down from your high, you're a sobbing mess, hole gaped and leaking. But your sister just chuckles, giving your soft cock a patronizing pat.

"Good sissy," she praises, tucking you into bed like a good little girl. You drift off, dreaming of being stuffed full again.