Tell me where it hurts....
Nick has a practical medical exam next week, and he isn't prepared. Katy, the brat of the house, is desperate to be an actress and jumps at the chance to help him out with his role play. Nick is over the moon; he's lusted after her for a while. He needs the practice for his exam, but would also do anything he could to get his hands on her.
When she begins to complain of a pain in her groin, and asks him to examine her, Nick can't believe his luck. He decides there is only one thing that will cure her, but it's huge, an she might need to take it in several doses.