IENF-021 A high school girl who pitied my pathetic self agreed to let me do 'so-ko' (frottage) with the promise of just rubbing. But we both got too into it, and her pussy was soaking wet! So I slipped it in! "What!? It's inside?" But I couldn't stop and

My little sister suddenly came to visit my room. She says she doesn't know how to study, so she teaches, but she gets tired on the way and falls asleep. I was lusting for her sleeping sister, so I started playing tricks on her sister without being noticed. I was so engrossed that I didn't even notice what happened to my little sister! My sister who couldn't see it just rubs it? and intercrural sex. That should have been the promise...?