Okie, so truth be told, it's been a while since I've read yaoi (I think I've read too much or something LOL) but these few manga are probably the best messed up yaoi I've ever read. But if you don't really like forced relationships or similar things, I'm warning you that this is pretty messed up. Of course, being the lil messed up sponge I am, I really really liked thee yaoi when I was still into it.
