Locked on by step brother's slutty wife - Chisako Ono

My stepbrother's wife who has a great sex drive. I am at the mercy of my tsundere stepbrother's wife, who seduces me every day. When my stepbrother goes to work, she starts to play tricks on me. One time, he deliberately masturbates, and another time, he shows me a married couple having sex. Finally, something happened. She sneaks in when I'm trying to sleep, and we cross a line that we shouldn't cross...