"I'm cheeky and distrustful of men..." I'm the worst I've been aroused by my girlfriend's tsundere sister and secretly keeps fucking her.

When I first met a cute woman, I went to her house for the first time, and I saw her younger sister, Naruha-chan, who was rebellious and looked at me with a cold look...! I was excited by her cold attitude and her face cuter than her. I couldn't control my erection and touched my beautiful body while my girlfriend was away, so I was guilty... However, the slutty little sister who resists at first somehow ends up getting addicted to my dick! ? My younger sister, who has been looking for a body to overlap with me, begins to fall in love with me!