sucker
Fred and George have discovered there used to be a dedicated cocksucker for each dorm. Now there's an interesting tradition that Hogwarts: A History somehow forgot to mention.
Anyway. The twins. A magic sex contract. What's the worry?
Poor Harry. He's killed Voldemort and is back at Hogwarts studying for NEWTs but he's still got to learn the two most important lessons of his life:
1. How to suck cock.2. Always read the fine print.