My wife and I's intimate life has not been good lately. Right now, my wife's sister, Ai, will stay at our house for a while. She looks very serious on the outside, but her body, especially her huge breasts, are clearly visible even when she's wearing clothes! What surprised me the most is that she is an erotic novel writer! While I was working, she came to my room and actively seduced me! My dick couldn't resist her charm, even though I knew it was wrong, I couldn't stop!