Nothing, she's not there

"Damn," you mutter, seeing the empty room. Looking around you remember searching it earlier, and do a bit of reconnaissance.

Weed? Check, right where you dreamed it. The discovery shocks you, making you doubt your assumption that you'd been dreaming.

"What about..."

Sex toys? Check, right under her mattress.

"Oh God, it was real!" you say to the empty house, and thump onto the mattress, staring from it to the mirror where you see yourself.

Greasy brown hair, acne-splotched skin made pale by staying indoors. A round body, soft because you hate sports. You stare at the guy in it and remember when you'd seen a gorgeous girl in it. A body that anyone would desire. A body that was yours.

Desire burns in you as you think of that body and how it was yours. The thought that it was is followed by the certainty that if it was done once it could be done again if you just figured out the secret, retraced your footsteps.

But first, that surging erection needs to be taken care of.

You've never looked at guys in locker rooms before so you have no idea how you compare. You figure you top out at five inches if you stretch it, probably closer to four. Definitely nothing like the porn stars. You'd love to have a giant dick. And yet, when you think about them they're plunging into you. Not in the gay way because when you think about it they're plunging into you cunt, or if they're going in your ass there's hands mauling your big tits.

Groaning at the thought you grab your rigid dick, pumping for all you're worth at the thought of cocks invading your sister's body. Your body.

It doesn't take much to get you off. Just thinking of guys using you as a sex-toy has you coming in less than a minute. Before you blast your load you pause for just a second. Your dick is aimed at her pillow, but you realize that won't do. With a wicked grin you lift the mattress, pushing it away from her collection of sex toys.

Seeing them and knowing where they've been - where you would place them - makes you moan loudly, an orgasm unlike anything you've ever experienced in this body roaring through you. It's like you hadn't spent half of last night masturbating. Gobs of semen splash across the pile of vibrators and dildos, your cum painting them white. When the orgasm ends you think of her unwittingly plunging your cum within her pussy or ass, and something happens that you've never experienced before.

You come again.

"Oh God," you finally groan, wringing out the last drops of salty semen. It feels like you must have dehydrated yourself, you came so much. Looking down at the collection you see drops and ropes of semen have touched everything.

"Enjoy sticking my cum up your fuckslot, whore," you say with a nasty grin, and decide to wait until someone else comes home before you put the mattress back on top of the toys. You don't want the mattress absorbing all that cum after all, you want the toys and her body to do that.

As you wait you think about what happened last night up until this afternoon. What prompted the change?