Immoral Sisters, or Ai Shimai: Futari no Kajitsu, is a three episode OVA that aired in 2001. Each episode is 31 minutes long. It takes its source from a visual novel which takes its source from a game.
Takedo Nogawa is the spoiled son of a wealthy industrialist. When he was younger, he was infatuated with Yumi Okamoto, his father’s personal secretary. But as she was also his father’s personal sex toy, Yumi was off limits for Takedo.
After he gets into a traffic accident with Yukie Kitazawa, an average housewife, Takedo sees an opportunity to one-up his old man. Per a contract drawn up by Yumi, Takedo allows Yukie to waive her legal fees if she becomes his sex slave.
Not to be outdone, the elder Nogawa sicks his secretary on Yukie’s teenage daughters, using the contract to exploit them for his own twisted desires. A sick game ensues as father and son compete to strip the Kitazawa women of their dignity. Immoral Sisters/Ai Shimai: Futari no Kajitsu is a story of power and those who abuse it, and all the sex they have in-between.
The characters were just there. They had no personality and all they did was get raped or have sex with one another. There’s sister x sister fucking, mother x daughter fucking , young guy x older woman fucking, and older woman x younger girl fucking.
This not my cup of tea but it might be yours.