My sister-in-law Nanami is beautiful but a little hard to get along with and is cold towards me. One day, while I was watching an adult video, she suddenly came into my room (lol). And for some reason, she didn't leave and we ended up watching adult videos together! That night, she came into my room and said, "You have to take responsibility for keeping me up at night (lol)." We crossed the line and started living as secret sex friends! Is her cold attitude when she's with her family to avoid her husband finding out? Or is she just trying to hide her embarrassment? A forbidden relationship where we do whatever we want from a completely subjective point of view! Living together with my brother's wife, who can't be honest with me, in an affair in the home!