Responses
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I gotcha my friend. What your looking for is this. (〜 ̄△ ̄)〜 https://www.mangago.zone/read-manga/proportional_to_him/
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I have found it! (๑•ㅂ•)و✧
https://www.mangago.zone/read-manga/hidoi_otoko_tenkawa_ai/
I've been searching for a while now but maybe I'm not looking in the right tags. It was a BL one-shot where the two men were a couple but one constantly cheated with women. The other caught them but during sex later says he doesn't mind if his lover has sex with women as long as he belongs to him or something along those lines.
Super grateful if anyone is able to help me find (⌒▽⌒)