Mugen Houyou

After a prolonged absence due to mental problems, Kuon, a young heir to a dynasty of powerful oligarchs, returns to his mansion. He is greeted by his wife, his associates, his servants, and other people who live in the huge family estate. Kuon has to continue the political work of his predecessors, but he is more interested in exploring sexual desires - his own and those of other people. But each "experiment" reveals more of Kuon's troubled past, and he will have to fight his childhood traumas and determine himself the limits of what he can allow himself to do...

[From Moby Games]