OK, I've only just started playing this game and something is bugging me already, the MC gets dropped on someone doorstep when he was 3 months old, the husband and wife adopt him, he's now 20 years old and he doesn't call the wife, mom, she's been his mother for his whole life basically, the he calls the girl his 'childhood friend' when she's basically his sister. Incest isn't tagged, so what was the problem with them being called mom and sister?