It’s all about the Technique - FamilyDick

Jax is completely naked in his room, trying to feel his prostate by himself. He is an experienced urologist, so he knows his game, but his stepson Tristan walks in on him and wants to be of help. Jax accepts the proposal and lets his stepson finger him. Seeing that Tristan doesn’t have his stepdad’s expertise, he suggests inverting the experiment so Jax can teach him how stimulation works. Soon, a finger is not enough and Tristan is begging his dad to use his cock instead. Playing doctor takes a whole new turn when Jax plows his horny stepson!