Dr. Dad, a man of science and medicine, finds himself in a taboo predicament. His stepson, a curious and eager twink, has caught him masturbating in the hospital's on-call room. Instead of shame, the doctor feels a spark of excitement. He invites the boy in, closing the door behind him. 'You're old enough to learn some things, son,' he says, his voice low. The twink, nervous but intrigued, nods. The doctor begins his lesson, his hands exploring the boy's body, teaching him about the surfaces of desire and the anatomy of pleasure.