へんたいイニシアチブ ～妹と従姉妹に握られ性活～

The house where I live with my sister.
A childhood friend’s cousin came from overseas.
I decided to come back and stay at the boarding house.

“Do you remember the promise that you would marry me?”
When my cousin said that, for some reason my sister started to get nervous.

One day, my sister and cousin came to my room He suddenly tied me up.