Responses
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http://www.mangago.zone/read-manga/renai_kidou/ *first story
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Addressing your statement about how most yaoi is about straight or one straight/one gay: that's kind of the point of yaoi. It's not meant to be a realistic portrayal of gay relationships. Homosexuality in yaoi is a metaphor for sexual awakening. That's why the straight or straight gay pairings are more common.
What are some yaoi stories about two gay guys? Most stories I feel like they are either straight to begin with or one is straight.