Saiteena Takashina-kun wa Gokumana Seijuu deshita

Overview

"It's through a condom, but please take it deep inside." Takashina-kun, whom she doesn't even like, is teasingly skilled at sex and makes her cum like crazy... It's embarrassing that it's obvious that she's just come for the first time, but what if his hotness reaches deep inside her? Chiko, a designer, harbors unrequited feelings for her married boss. She's been assigned to mentor Takashina-kun, a sleazy junior colleague who's a notorious womanizer. On her way home from work, Chiko stumbles upon a chaotic scene between Takashina-kun and his mistress, and he half-forcibly takes her to an izakaya for drinks...!? Two people with troubled love lives. A purely physical romance begins!? (Source: Shusuisha, translated)

Source: AniList