Mother abandoning her son due to pure selfishness. The worst: Did not come back later even though her mother who took care of her son died, because in the meantime she had created a new family ...
Step father abusing the uke in the past -> causing him to use his body to protect himself in the future
Step father abusing step son
SPOILER
father killing his own daughter because she is an omega....
Reo was not treated well by his mother and afterwards deserted by her.
SPOILER
If I would see my child having sex with my lover I would want to protect, not to abandon him .... Grrr that woman makes me angry.
But anyhow, I'm happy that he ends up with uncle :-).
So basically, his mother rejects him for no acceptable reasons and he has to sell himself to earn some money to live. A real heartbreaker.
SPOILER
Kirino's mother. She should have had accepted her sons sexuality. Even though it got a little better at the end, I do not like how the story ended for her son.
I don't think that he can be happy by surpressing his true self.
Child was abused by step father and mother does not see what is happening right before her eyes.
Abiru Junjou