My convenient sex friend is already a married woman. Usami Snow

Yuki, a newly married married woman, can't tell anyone about her secret: an affair with her childhood friend. Yuki says, "I and he are my siblings in my heart." But that's what you're doing and call a "convenient sex friend" hotel and do whatever you want. The two have been dating for a long time, so they know the points that make them feel good. There are many intense plays that husbands and wives would never do.