18+ Maid Kyouiku: Botsuraku Kizoku Rurikawa Tsubaki The Animation

After the Rurikawa clan fell into disgrace, the daugher of the clan Tsubaki is sold to Lord Poiman as her personal maid. Tsubaki won't let her new position trample the pride of her family, but with no way to refuse to his orders, Poiman trains her as his new toy, enjoying each new crack in Tsubaki's facade.