Well, I don't know about stories, but here's a list with quite bad yaoi anatomy...
http://grumpsaesthetics.tumblr.com/post/128759927597/my-ultimate-personal-collection-of-bad-yaoi
Some are seriously hilarious (especially together with the comments)
You didn't know it yet? XD it comes out everytime someone asks for the weirdest thing people have ever read (along with http://www.mangago.me/read-manga/children_can_t_choose_their_parents/ )
Do you know any yaoi/shounen-ai "so bad it's so good"?
The type of manga that are so bad that makes you laugh a lot.