I'm looking for a yaoi manga

So I've been looking for s manga that starts with 3 childhood friends and two of them are dating and the other doesn't know until one day he ended up hiding in the closet and saw the having s*x and he was not alone he was with one of his childhood friend younger brother who happens to like him but they are end up together but it's still ongoing the last time bato was working just fine so please help me find it