Gravitation, the first shounen-ai anime I watched. Didn't even know what I was watching until my brain finally caught up with my eyes. Quite a good watch I guess, the music always bring back memories of the anime.
My second favorite anime show is a romantic Comedy show. It tells the story of a rock singer, Shuichi Shindou and his relationship with a famous author, Eiri Yuki. I'll admit that the first time I saw this, I didn't know the romance was between two guys but that made the series a lot more interesting. It's a funny show with great music too: Gravitation