Rushing to the dentist just before closing time, he seeks a sexual encounter with his sister-in-law, who works there as a dental assistant. On the first visit, a new assistant keeps interrupting, preventing him from making progress. Yet every time her large breasts brush against his face, his excitement grows. On the second visit, only the new assistant is present, and though he seduces her and enjoys her ample chest, he's humiliated when she tries to take control and he's forced to flee. Finally, he finds himself alone with his sister-in-law. Steeling himself, he forcefully kisses her—and to his surprise, she readily gives in, as if starved for affection, and they engage in intense sex right on the examination chair.