Responses
There's a second story in here http://www.mangago.zone/read-manga/konomi_ja_naka_to/
that sounds like the story you're looking for.
beta
looking for a bl manga where the uke is the seme's best friend as well as sex friend but the seme is straight. the seme wants to get married too which worries the uke but then another guy shows up and says that he and the uke are also sex friends