Ukesen Boy wa Kamiteku Danshi to Sex Friend ni Naritai!

Naoya is a bottom and works at a brothel where he dreams of finding the dick of his dreams -someone who can satisfy his craving for sex. He is ranked first amongst clients until the newbie top Yuta steals the spot. Yuta has all the things Naoya is looking for: a big dick and exquisite technique, but their first meeting didn't go so well. When a request from a client requires both of them to work together, Naoya finds that there's more to Yuta than just sex.

(Source: Fantasista Inc.)