All I remember is that the protagonist had a brother who was an omega and had a child with their crush. Their brother runs away after giving birth, so the protagonist takes care of crush and child thinking he is just a substitute.
https://www.mangago.zone/read-manga/good_night_baby/
All I remember is that the protagonist had a brother who was an omega and had a child with their crush. Their brother runs away after giving birth, so the protagonist takes care of crush and child thinking he is just a substitute.