Haruka had a secret that she couldn't tell her husband. I once had a physical relationship with my brother-in-law due to the stress of not having sex with my husband, who devoted himself to work. Haruka had intended it to be just once, but her brother-in-law asked for a reason to visit her husband when he was away and devoured her body. Haruka refused at first, but as she repeated the number of times, the pleasure became addictive...