Dustin watches in shock and confusion when seeing his foster brother start to change. First Ty's hair got longer and his face looked a bit more feminine as well. Not only did his body became more like a female's, Ty also grew a few inches in height as well. Breasts began to form and expand on his chest, jigging after the growing stopped at double D cups. Dustin looks down and expected Ty's cock to vanish, but instead it grew in length to a solid 12 inches! The transformation was finally complete, and there stood Ty as a 6 foot tall beautiful futa.
"O-ohhhh Dustin~" Ty strokes her huge cock to have it throb in her hand, the other hand firmly groping one of her new breasts as well. "You look soooo sexy, Dustin. Why don't you come over here and help me out with my new body?"
Dustin was so horny he didn't even take a second to hesitate on the question, walking back to Ty and placing both hands on her shaft. He starts to stroke it, while Ty squishes her foster brother's face with those big mounds she has. "That feels so nice! Keep stroking my cock, Dustin!" Ty's hands move to her brother's rear to part his cheeks wide, making the teen yank his face from her boobs to try to protest.
"Oh you're so silly Dustin! Thinking that you were just not gonna expect me to fuck that cute ass of yours?!" Ty pushes her brother onto the bed and turns him over, making sure that ass of his was in the air and presenting well.
"T-Ty please!" Dustin cries out in a desperate attempt to get his futa-sister to stop. "It won't fit, It won't fit!"
"Don't be a bitch, Dustin!" Ty spits on him and laughs, prodding the entrance with the head of her cock. "On second thought, you can be a bitch! Now moan for me!" Right before finishing the sentence, Ty thrusts half her shaft inside Dustin, making him scream out in pain and pleasure. "Fuck that's tight! Now lets get the rest of it in there!" Ty pushes deeper in very slowly, enjoying the cute moans that came out of his brother. Tears were rolling down on Dustin's cheeks from the pain of how big it was, but pleasure was starting to overcome the pain part. "O-ohhhooo yess! Fuck yess your ass feels so good, bro!" Ty then starts a steady motion of fucking her brother, hips slapping loudly against the teen's butt cheeks filled the room with noise, though their moaning and screaming was louder than that. It was amazing that June or Mark didn't check on them to see what the hell was going on, but for the moment the two could care less on who walks in on them.
"O-oww oww! You're being too rough, Ty!" Dustin groans out, taking the pounding pretty well for his first time.
"What's wrong?" Ty laughs, her balls swinging with each thrust as they were fill to the brim with cum. "Never had a girl fuck you in the ass before? Get use to it, Dustin! For now on you're my bitch boy!" Ty goes at full speed, thrusting harder and faster than ever. "Fuck it! I'm gonna cuuummmm!!" Ty gave one last thrust, her whole length inside Dustin before climaxing. Rope after rope of semen filled Dustin's bowls, slightly inflating his stomach. The weird experience he was feeling made Dustin orgasm as well, shooting what little jizz he had left onto the bed. Ty pulls out her cock and watches her cum flood out of the teen's asshole. She must have came a lot, the boy's asshole was gaping and her spunk was flowing out almost like a waterfall. "Ahh good bitch...now lets see what other kinds of fun we can have.."