I'll Have My Cake and Eat It, Too.

Overview

With his sharp looks and handsome face, Kenta Sasanuma's boss, Wataru Kuji, is Mr. Popular with everyone... In reality, though, he loves physical pleasure... and will do it with anyone!! Now, it looks like Kenta's well-endowed manhood is in his sights. Almost every day, be it in the restroom or a meeting room, Wataru buries his face in Kenta's lap and then practically begs him to stick it in. Kenta's poor junk is being all kinds of exploited by his relentless boss...! Tossed about by his aggressive bottom of a manager, plain-old sales rep Kenta is in for a happy world of trouble. (Source: Renta!)

Source: AniList