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I'm looking for a BL manga, where the protagonist had a girlfriend and he wanted to try anal (he asked her to do it to him), the girlfriend didn't want to do it so she broke up with him, and he ended up crying or drinking (I don't remember) and he tell the story to... a guy in a bar or his neighbor(?) and the guy is like "well I can do that for you" so they do it... and well I do remember they become a couple by the end.
So... anyone remembers?