Majime ni Otsukiai The Purely Consensual Couple

Synopsis

Raised in a household with the mottos "illicit sexual relationship prohibition" and "serious and sincere," Minami is currently in the companionship of her senpai at work for the 3rd month <3 they are in a pure relationship where they haven't even kissed. But Minami has a secret that she can't tell to the mature and calm him... That is, she reads ecchi manga at home and has delusions about them, in other words "a pervert who's always on their best behavior"...! At that time, she accidentally drops her ero-manga at her workplace...!? (Source: Kodansha, translated)