Himejima Akeno (High School DxD) participated in a BDSM session with Barakiel, her own father.
Once, Akeno, accompanied by Issei and Gasper, visited the fallen angels' facility.
In that place, the fallen angels were doing various experiments with humans (who had freely volunteered) in order to awaken dormant powers in their bodies.
Akeno ends up finding this interesting and one of the researchers asks her for help.
Akeno wears a sexy dominatrix outfit, and has lots of BDSM sessions with lots of guys. She whipped, cursed, stepped on and humiliated humans (all men).
Due to various other circumstances, Barakiel, Akeno's father, ended up participating in this BDSM session with his own daughter.
Akeno didn't care about that at all, seeing her father half naked and trapped in an X-shaped cross, and started the torture/training.
Barakiel was VERY EXCITED about this. BEING WHIPPED AND HUMILIATED BY HIS OWN DAUGHTER.
I even imagine he got an erection.
He comments that it reminded him of the times when Shuri, Akeno's mother, was alive, and that the two of them always did that kind of thing.
Afterwards, Akeno is revealed to have a sadistic side (inherited from her mother) and a masochistic side (inherited from her father).
OFFICIAL ILLUSTRATION of Akeno participating in a BDSM session with Barakiel:
