Son is the "toy" of his father.
Butler holding his former young master hostage. It's twisted in how protective and obsessed the butler is, but the uke isn't brutalized or beaten into submission. The manga operates more on a bit of a codependent level on the uke's part.
Sadistic bully "demon" rapes unsuspecting student.
Victim of an accident holding his friend accountable for it for the rest of his life. Twisted mutual codependent relationship develops.
The most realistic portrayal of the effects of emotional, psychological, physical, and sexual abuse on a young teen I've seen in a manga thus far. Heart-rending, emotional, visceral, tragic, very very real and painful. Stepfather x Son incest/rape
Brother x Brother incest
Unfortunately on indefinite hiatus forever, it seems.
Father x Son incest, self-harm.
Kidnapping, rape.
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Great list!