Boy/man none related siblings adult

Eight years ago, our parents remarried and we became brothers.Haruto is six years older than me. We’re not related by blood, but he treats me kindly and takes care of me as if I were his real brother.Because of this, I started harboring this desire to monopolize him….I don’t want him to find out about these dirty feelings!Although I live alone now that I started university, my brother found a way to come after me….!?

Yukio, a young office worker, is molested daily on his train commute by a high school boy. One day, his father tells him they will be moving in with his lover and he finds out that the train molester will now be his little brother!