20 years old and still a virgin. My stepson is a cuckold

I'm really starting to worry that there's something wrong with my stepson Kevin... He's 20 years old and has never had a girlfriend. Not even a boyfriend. That's why I've invited Conny round to show the lad how it's done. Kevin has to sit on the chair next to the bed and watch us. Let's see if he gets a move on... My plan was different to Conny's, though, because he suddenly turns my bare cunt towards Kevin and offers to touch it. Will that go well? Or will the situation get completely out of hand?