Fiction by Kristina Riggle.
This "ripped from the headlines"-type story is about a teenage girl who has an inappropriate relationship with her calculus teacher. (Does anyone else think it's weird that he's a math teacher? Isn't teaching English more romantic? But I digress.)
The interesting thing is how everyone else in her life is affected by it, from her parents to her classmates to the offending teacher's wife. It's a good character story, and really explores a difficult issue without turning the people into tabloid-y cardboard cutouts. It's a good book.