Responses
Hope this is what you are looking for
http://www.mangago.zone/read-manga/zettai_bl_ni_naru_sekai_vs_zettai_bl_ni_naritakunai_otoko/
Thank you, this was it
It was about a guy who'd realised he was in a yaoi world, and was avoiding raising any yaoi plot flags. I thought I'd put the story in one of my lists, but I must have forgotten