Responses
Aaaand...I found it. Thanks, Me. I'm glad I asked!
In case anyone wanted to know:
http://www.mangago.zone/read-manga/otouto_no_otto/
Perhaps it’s this? http://www.mangago.zone/read-manga/otouto_no_otto/
It’s written by a famous bara artist but it’s not BL/bara and i think there’s even a drama
It's not one I've read, but one I thought I might read, so I don't know much.
If I've remembered the synopsis correctly (and the details may not be quite right), it's about a guy and his deceased brother's boyfriend/partner. (There MAY also have been a child of the first guy, but I'm not sure.)
Oh, and it wasn't tagged as any kind of BL, I got the impression it was supposed to have more of a family feel.
I can't seem to get it through a search or tag search, so thanks, if you know it!