Yasashii Milk

Yomogi Aoba is a struggling 35-year-old writer. Her editor suggests writing about sex services for women but refuses. However, after learning her friend with benefits and former editor, Ryo, will soon marry, she begins to feel the loneliness creep in. Wanting affection, she decides to try out the sex therapist service her editor introduced her to. To her surprise, the one at the door is none other than her young and attractive housekeeper, Rin!

(Source: MangaPlaza)