The Butler and the Captured Princess

Komiyama Kazusa is the daughter and heiress of a financial conglomerate. Her father is distressed by her dislike of men, and assigns a blue-eyed butler, Kairi Murasame, to teach her to be a woman. Kairi is trying to get her body accustomed to being with a man, and is training her to be a virgin, but Kazusa is losing her mind, unaware that he has a secret nature.

Source - UNext