John then felt his ass cheeks move.
He twists around to see that his ass has grown out from him forming Kevin's scrotum. He can feel the sac and both the balls inside moving around.
He looks back up at Kevin, who is smiling down at him.
"I should leave you like this, halfway through the transformation. You look pretty hot as my dick but with your body."
John tries to move but only manages to writhe a bit.
Kevin laughs. "A dick that moves by itself, this is great! But I will eventually have to change you completely. I wanna be able to put you places that I don't think you would enjoy in your current state."
Kevin places his massive hand at the base of his dick, right around John's waist. "So which would you rather that I do?"
John replies ...