My Cranky Butler Won't Take His Glasses Off in Bed!

Himari, a woman with no living relatives, found herself being helped by a cool and sadistic personal butler! "Please just moan out of desire for me." She's powerless against the pleasure she's feeling that makes her innocent body melt during her "lessons"... Himari was struggling with poverty after her father died, but suddenly a handsome man wearing a tailcoat and glasses appeared in her life. He said he's Kurosaki, her personal butler, who was ordered to train her as a proper young lady on command of her grandfather. Himari had never met her grandfather, so she wanted to rebel, but she decided to go along with it for now to eventually win her freedom. However, Kurosaki said, "You need to get used to men," and started giving her lewd bridal training lessons. What is Kurosaki's true identity behind his mature composure and skilled techniques that he uses to make her go wild? Source: Renta!