u/AdimusReika

I need help finding a hentai manga where the heroine is adopted by the protagonist's family, but she feels uncomfortable and like a burden to them. He helps her overcome this; he has feelings for her but keeps them hidden because of how she feels about her family. She also has feelings for him, until he brings a friend home who becomes interested in her. The protagonist ends up having to leave the house, leaving the two alone, and his friend convinces her that he only sees her as a sister and has sex with her. The protagonist arrives and sees them in bed after the act, and later, when the protagonist is taking his friend home, the friend says he will date and marry the heroine.