Please help.

I cant get this manga out of my head.
Its about stepbrothers. I think the older one was gay from the beginning whereas the younger brother was straigth at the beginning of the story, but as the story goes on the younger feel more affection toward the older. They lived under one roof. The younger decide to live on dormitory once he realized his feelings for the older. I remember his roomate as a boy with glasses and having his own pairing with their teacher (?)

Omg. This is driving me nuts. Please help meee