Kitty's step-brother has a friend who's had a crush on her for years. He and Kitty are good friends too so when he pops over for a visit, she invites him inside. He's been away at college so there's lots to catch up on. When they get on the subject of one of the classes he's taking, he offers to give her a little demonstration of what he's learned so far. He trains Kitty into obedience and she goes very deep. He realizes that Kitty will do absolutely anything he commands. Kitty is transformed from cute younger step-sis, into obedient sex slave. (simulated - no real sex, no male nudity)