Nuidara Zetsurin!?: Karada no Aishou de Musubu Keiyaku-kon

Overview

"If you can satisfy me, I'll marry you." Kisaragi Hana, who does her job perfectly, gives it her all at work while caring for her hospitalized grandmother without letting her colleagues know. Her parents died at a young age and she is a doting granddaughter, so it came as a shock when she heard from the doctor how much time her grandmother has left to live... In order to realize her grandmother's wish to see her in a wedding dress, she discussed it with her colleague, Kudou-kun, who found out about her grandmother's condition. And he actually accepted?! However, he said that he needed to confirm their compatibility for SEX first. Even though he is usually docile, when it comes to sex, he's intense, rough, and aggressive!!

Source: AniList