This guy falls in love with the guy that his brother was dating.
Here's a stepbrother story. They both act like they aren't in love and hurt each other by denying it. Then one of the brothers crack and they end up together. It's not bad at all. I actually did enjoy it. The older setepbrother has a hardcore phobia of women, and the younger stepbrother sleeps with women all the time to get away from his brother.
Teacher and student
Brother in law
Bro x bro. The seme didn’t know that he slept with his younger brother but then he figured it out. It’s has another plot twist. I enjoyed this story but if incest bothers you then don’t read it. This would be super cringy
Koi Shika Dekinai yo