Goshujin-sama, Maid Fuku o Nugasanaide.

Sou was born to a traditional upper class family. It was decided by his family that he will marry his childhood friend Chinatsu when he graduates from school. To ensure that his married life will be perfect, his maids provide sex training to him. While Sou obediently follows along, Chinatsu would not allow anyone else to have sex with him.

[From Hau~ Omochikaeri!]