This role-play is performed by adults. My sister-in-law, a gal who loves sex, calls me "virgin-kun" and makes fun of me, but contrary to her appearance, she's surprisingly kind and treats me equally even though I'm a shy girl. One day, a coincidence happened and he ended up giving me a hand job! From now on, am I my sister-in-law's sex slave? In the end, they even made me have sex... My sister-in-law tried to train me as a sex friend, and as we had sex over and over again, I started to want to have sex without the condom I was wearing.