Protagonist was a slave being experimented on by the demon army. The experiments caused him to awaken a hypnosis ability. So he gets back at the demon army by hypnotizing and then screwing them all.
Green haired woman is the sadistic doctor that was experimenting on the protagonist, including increasing his pain by 1000 times, so the protagonist increases her pleasure by 3000 times whenever he comes inside her.
Black haired kemonomimi woman is an honorable warrior type that looks down humans. The protagonist humiliates her by treating her like a slave.
Red haired girl is a vampire that uses people for their blood. The protagonist hypnotizes her to love human semen instead.
Blue haired woman is seen as the mother of all demon kind. She thinks human are only meant to be food for demon kind. Protag hypnotizes her to believe he is one of her beloved children.
Silver haired woman is the demon queen. Her strong willpower lets her resist the full effects of hypnosis. As she is about to kill the protag, the female hero (yuusha) breaks in.
Blond haired woman is the female hero. She fights the demon queen and they both become exhausted. Protagonist tries to hypnotize the demon queen, but ends up hypnotizing them both due to their weakened states.