For the first time in centuries, Hogwarts has a new class available for students. Everyone's anxious, and no one's sure what to expect—but they sure didn't expect a math class.

Yesterday Harry's life was perfect; Voldemort was defeated, he got his dream job, and he's working up the courage to propose to Ginny Weasley. Today he's married to Draco Malfoy. Walking with the past two months of his memory gone, the rivals find themselves in a sticky situation; and the only way out means a lot of spooning, karaoke, and cookie dough. Hold on to your hats.