Oh, boy. I feel like it depends on the day, but in general, probably Be My Buddy. It wasn't for a long time because I had read it so much while I was writing it and then it seemed so outdated because my writing skills improved a lot. But, recently, I've been rereading it and I'm kind of falling back in love with it, errors and all. That being said, I also love Got Game? and Smirk or Nothing. In Their Skin would be up there, but since it's not finished, I don't feel like it counts yet.