Overview：
My parents remarried and my two step-sisters were actually having an affair! I thought they got along really well,but they were sisters of the same sex,so I thought that was all there was to it,but it turns out they were more than just sisters! They would flirt with each other when my parents and I weren't looking,and when I wasn't around,they would have intense lesbian sex! It was an intense lesbian sex scene with a sense of immorality that should not be discovered by the family,but I happened to see it. Then she told me to keep it a secret from our dads,and it developed into a threesome! In the end,I also ended up getting caught up in a forbidden relationship,hiding it from my parents!
