I dont know how I feel about this manga since the uke already has a lover and they seem ha...

I dont know how I feel about this manga since the uke already has a lover and they seem happy-ish and then we just throw the step brother and I don't know how it will fit since the uke doesnt see him in a sexual way ugh... Feeling sad for the step brother... And dont know where he will fit in. And I feel like something is going to happen to the uke's boy friend.. Gut feeling...someone help in giving me an idea of how this would go..(〜￣△￣)〜