Front Innocent by Satoshi Urushihara. Play as John, training half naked maids (and half naked ladies) in the victorian mansion. Three main characters (Jane, Faye, Sophia), and few more minor ones.

Welcome to the Pandora Mansion. placed in 1920s -1930s Europe, a place with a reputation for decadence and debauchery. It is owned by Lady Silvana, a libertine who intends to make it a place where she and her friends can live out their fantasies free from the societal norms of the world ruled by men.