I need help finding this yaoi

I read a yaoi a little while ago, and I cannot for the life of me remember what it was called. This is what I remember what it is about. There is a guy who is a writer and one day he goes out for a drink and wants to sleep with a guy because I think he had a bad day. The guy that he ends up sleeping with turns out to be a fan of his work and he confines the writer so that he can see how the character from the writer's story would get their happy ending. The writer was not planning on giving him a happy ending so now he has to act like his character and rewrite the story to his advantage so he can try and escape.