The floorboards shook as a shadow fell over him. Dave had stepped up, his 13-foot body towering over Nate's as he looked over his shoulder. The small boy didn't even make it to his knees!
The massive, muscular humantaur knelt until his enormous pec shelf (which protruded from his body nearly two feet) rested on his tiny boyfriend's head. "Is it my turn to be changed?"
Nate looked at the massive man. "What? If anything, it's my turn to be transformed after all of that!" He gestured wildly at Dave's body. With each second, he grew more and more panicked. A pair of arms reached out and captured Nate's wrists, holding him still as the other two on his first torso tried to calm him down.
"Hey, hey, it's okay. I think I fucked you too hard, you're delirious and confused. The last changes you made were to your height. You made yourself even smaller for me, which is really sweet, by the way. Fucking a boy a quarter of my height was exhilarating."
"No, but then I gave you more cocks and it malfunctioned and you're too tall and big now, and, and," Nate blubbered before he was silenced as his face was stuffed into Dave's massive pecs.
"Shh, calm down. You're obviously not well. Nate, I've always been this way, ever since I went through puberty and caught that disease. And you loved it. You love my big, humantaur body!" He gave the twelve-year-old a firm pat on the back, before sitting him on top of his second torso, letting the huge muscles of his taur back cradle the whimpering boy. The four arms from his second torso came up to hold him in place, and stroke his sweaty body, while his front arms grabbed the computer and began to type.
"It's my turn to change now, Nate. What do you think I should do?"