2) She admits her fetish to her boyfriend (or just a friend, or anyone else). She really, really likes to play with balls. From their smell to their taste. Maybe she's just envious and wants her own? But she tends to pay a lot of attention to them, even bringing up that she'd like to feel them explode while he fucks another woman. How can he say no?
3) He's one of the smartest guys in school but he has had no luck with the ladies. Well, his luck is about to change. The head cheerleader is on the verge of failing a paper and losing a chance to cheer for homecoming. She only has a couple of days before she has to turn in another draft and hope that she passes it. So she comes to him with an amazing offer to give him something to always remember her by in exchange for the paper. He tells her he'll only do if it she doesn't stop until his cock is no longer hard, no matter what. She agrees, and ends up having a very long night and a stiff jaw. Maybe she'll get tired enough to get him off in new and exciting ways as well?