Ty lets out a very loud, sexy moan as his voice becomes much more feminine. His whole body was beginning to change, his chest grew till large D cup breasts formed. Ty's cock shrank into his crotch and a pair of pussy lips formed between his legs, instantly getting soaking wet. The rest of his body became more slender and finally his hair grew to a medium length. Dustin could hardly believe that his foster brother was now his foster sister, the surprise gender transformation made his shaft throb and ache with the need to be used.
"Ty...are you okay?" Dustin takes a few steps forward out of curiosity, wanting to get a closer look at the now-female. Ty looks up with beautiful blue eyes and licks her lips.
"I'm sooo horny Dustin!" Ty starts touching herself, breathing heavily like a bitch in heat. "I want your penis inside me, Dustin! Give it to me!"
Without a second to lose, Dustin fast walks the remaining distance and picks up Ty into his arms, intensely making out with her while she straddles herself around his hip. A few more adjustments and Dustin's cock was already pushing inside Ty's completely wet pussy, making Dustin gasp from the sudden pleasure and Ty scream his heart out with ecstasy. It was a wonder how June or Mark didn't investigate what all the noise is about, but even if they did the two teens were too preoccupied in their love-making to even notice anyone coming into the room.
"Your pussy feels amazing, Ty!" Dustin begins to thrust and bounce Ty on his cock, standing and holding onto the horny girl as she clutches on to his very sexy-built body. "I-I don't know how this happened but I don't care!"
"Fuck me Dustin fuck me!" Ty begs, drooling all over her brother's shoulder as she hangs on tight. The feeling of his brother's cock pounding him already sent the whore through ten orgasms in the span of just two minutes. "Ohmyfuck your cock is fucking great! Fuckmefuckmefuckmeeeee come onnnn!! Jizz in me, Dustin KNOCK UP YOUR SISTER! FuCKING CUM INSIDE ME!" The loud screaming and moaning of the horny teen was enough to push him over the edge. Dustin groans and gave his final thrust, exploding inside Ty and unleashing string after string into her womb. The two passionately kissed each other before laying on the bed, pulling out of her to watch his jizz seep out from her wet folds.
"I love you Ty..fuck I don't know what's going on in this world now but I am glad I can fuck you in it whenever I want." Dustin kisses his now-sister again, getting lost in the moment.