Ty stammers "I wish you would suck me off!"
Dusty is taken aback "W-what? Keep wishing you little... what is happening?" Dusty's body moves against her will as she kneels beside Ty's bed and grabs his dick. "Oh God, why is this happening? Why can't I sto-ph!" She is cut off as Ty's member enters her mouth.
Ty grunts in pleasure "Okay, the short version is, I got the power to make any wish come true... and if you're good, I won't wish you into a mindless bimbo, got it?"
Ty hopes that it doesn't come to that, the main reason he is even attracted to her is because she has a male and female mind. Partly as retribution, but also because she knows where the sensitive parts of a penis are. This is the best blowjob that Ty has ever had. The pleasure welled up inside of him until it burst out of him and down Dusty's throat.
Dusty chokes on her brother's cum "... this is sick, it's incest! I'll neve-"
"Ah, ah, ah!" Ty wags his finger "Be good, remember?" He lays down on the bed and motions for her to join him. "Of course I wished for infinite orgasms. We could go all night!"
Dusty is shocked at her situation, her head hurts, but she still complies and removes her clothes before crawling onto the bed with him. Ty gropes at her half formed genitals, eliciting a yelp from his sister. He focuses more on Dusty's micro-penis, bouncing it between his fingers before sucking on it. Dusty's body shutters as she holds onto Ty's head for support.
"That's really sensitive, isn't it?" Ty asks.
"Y-yeah..." Dusty whimpers.
Ty moves Dusty onto her back and positions his dick in front of her tiny vagina. "Wait, please Ty, I'm really tight, tighter than other girls, It'll never fit!" Dusty pleads.
"Then I wish that it would." Ty says. He pushes into her but she some how stretches around his massive member without any pain. Dusty screams in foreign pleasure as Ty rams into her before exploding into her still infertile womb.
"God... I fucking love you..." Ty groans into Dusty's ear.
Suddenly the two incestuous siblings hear the sound of a car pulling into the driveway. "Shit," Ty says. "Mark and June are home. I guess I'll show you my great stamina after the dance friday." Ty gets up and pulls his pants back on. "What's wrong?"
Dusty had curled up into a ball and was clutching her head. "Head ache... really, really bad head ache... ow..."
Ty looks at her. "Then go get some aspirin. See you friday night." He leaves the room to deal with his foster parents.
Dusty agonizes on the bed, soaked in water from the shower, sweat and her brother's cum. She still didn't know which memories were real. But she was more determined to figure it out than ever. "...Yeah... friday... I'll be ready..."