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Shion (who's the MC) gets turned into a woman because one of his ex gave him some weird medicine, after that Rui (his best friend) has sex with him and after some time he turns back into a Man, it turns out that the way for him to go back is to have Rui cum inside him.
Currently Rui likes Shion and Shion is confused if Rui likes his girl self or his boy self, they're figuring it out.
can someone briefly explain this? how is it a yaoi i thought there was a woman involved