I read this manga years ago, and can’t remember the name or find it.
Love triangle/threesome.
Two childhood friends are main couple. Seme intentionally developed a bandage kink in uke from young age.
2ML comes in (step brother?) and wants to be seme.
1ML ends up fucking uke on top of 2ML, who realises he actually loves being super submissive. Happy days.
Manga likely circa 2013.