I'm alone with my beautiful girlfriend... Suddenly kissing a tongue kiss, she licks her all over and has sex with her all over, Is this the worst thing I can do...?

Her sister suddenly comes to the apartment where she lives with her. "Can I stay at night?" The two of them return home, but the older sister stays without returning to their parents' house. The next day, she goes to Tokyo to switch job hunting, as if she were switching to her sister. "That's fine, just keep it a secret from my sister..." For the three days she was away, she was alone with the overly beautiful lady. I was left in love with my sister Tsukasa's deep kiss and the lewd licking and sex... The masterpiece of reverse NTR drama is born here!