Mika and I have been dating for a while, and today I was invited to her house. On the way there, Mika, afraid that I might be embarrassed, warned me about her older sister, Ai-san. Her sister has a habit of... being nude at home! Even though I called ahead for her sister to prepare, when I arrived at the house and met Ai-san, I could clearly see her nipples through her thin top! Not only that, while we were sitting down to eat cake, Ai-san kept teasing my cock with her foot, causing me to drop my chopsticks on the floor. When I bent down to pick them up, I was faced with Ai-san's exposed pussy because she wasn't wearing any panties!!! Ai-san continuously used her large breasts to seduce me, and I couldn't take it anymore, so I went crazy and had passionate sex with her! The thrill of having secret sex while my girlfriend was nearby, especially being able to play bareback!!! Unlike Mika, Ai-san allowed me to go bareback and cum inside her! The pleasure of having sex with Ai-san made it impossible for me to get hard when having sex with my girlfriend. I immediately left to find Ai-san. Eventually, Mika found out, but I didn't care, I wanted to have sex with Ai-san, to enjoy the feeling of her large breasts and the pleasure of bareback sex. In the end, I broke up with Mika and started dating her sister...