On the fourth day of summer vacation, my fair-skinned, F-cup big-titted sister Nene came to visit. At first, I was just teasing her by touching her breasts, but the stimulation kept building until our playful fun turned into a pleasure-filled hell. As punishment, I made Nene-sis use an electric massager on my cock, giving me an itchy, uncomfortable sensation. In retaliation, I made her use the massager too—she started laughing, but soon began moaning, her pussy twitching uncontrollably. She kept saying "Stop," but eventually, she squirted and pissing herself while trembling. That moment turned me on like crazy. After that, we had intense sex—her tight pussy felt so warm and welcoming, and watching her big tits bounce in front of me sent my arousal through the roof. I couldn't hold back and gave her a creampie. I definitely won't tell Mom about this.