Step

"Your parents would be out of town, and they left you in charge of your little step-brother. The two of you get bored, and decide to play either a video game, a board game, checkers or something like that.
You decide to make a bet to make it more interesting. You explain to him that you recently got your hands on some shrinking pills, and that the loser should have to be shrunken for the rest of the night. He agrees, and you play the game, easily beating him.
He tries to back out, but you convince him saying that the pill makes him basically invincible, and you promise to give him the antidote before you go to bed.
After he shrinks, you pick him up, and tease him about being so tiny. You talk about what you should do to him now that hes so tiny, and decide to put him in your mouth and suck on him for a bit.
You go to your room and start to get ready for bed while hes still in your mouth. You take him out and hold him up to your face, and explain that youre having too much fun playing with him to change him back yet, and that since you beat him so badly youve decided to extend his punishment by a day. You explaing that youre going to bed and in order to keep him safe youre going to keep him in your bra until the morning.
Cut to the next day. Youre lying on your bed in a bra and panties with your tiny step-brother on your stomach. You explain that feeling him squirming around on your nipple all night felt amazing, and it gave you an idea. You start rubbing him up and down your body before tucking him down in your panties. You start rubbing your crotch over the panties before sticking your hand down your panties and saying you want him inside you.
You stuff him in your pussy and masturbate with him inside you. After you orgasm you lay back and take a nap with him still inside you.
Youre woken up by your phone ringing, you answer it and its your step-mom. You ask about her trip etc and she asks about your step-brother. Thats when you remember that hes still inside you and kinda giggle. You start rubbing your crotch and tell her that you had decided to go camping or something and werent there.
After you hang up look down at your crotch and say youve decided to just leave him at that size, and keep him as your personal little sex toy. You tell him youll tell your parents you never came back from camping, and theyll believe you because people get lost in the woods all the time…"