One night, my girlfriend was supposed to be away, but she was sleeping in my bed, so I slept next to her. The next morning, I was wondering why she was being so aggressive, and when I turned over the covers after she woke up and gave me a blowjob, I found that it wasn't her, but a beautiful woman I'd never seen before! I was confused, but she told me, "Um... it's my sister, Rima." I was toyed with by Rima's cowgirl position and ended up cumming inside her... And we spent the limited time we had until she came home, all having sex... Cowgirl position, deep body wash blowjob, footjob, electric massager and vibrator masturbation, continuous cum shots, facials... Rima's mischievous slut techniques completely destroyed my reason. I fell for Rima, who was the complete opposite of my girlfriend, and I cummed a total of six times! And then I found an unexpected truth... 130 minutes of heart-shaking fun.