On the fourth day of summer vacation, my fair-skinned big-titted sister Nene came to visit. We started out playfully touching each other's breasts, but before I knew it, things escalated and my stimulation grew more intense. As punishment, I used an electric massager on her, which made my cock tingle and my feelings shift rapidly. When I retaliated by using the massager on my sister, she first laughed it off, but soon began moaning, her pussy twitching erotically. Even though she repeatedly said "Stop," I couldn't bring myself to quit, and watching her squirm and pee herself made me realize just how perverted I truly am. After that, we had intense sex—her pussy was so warm, and seeing her huge tits bouncing right in front of me pushed my arousal to the maximum, making me creampie her. This experience was an intensely private, forbidden pleasure I never want anyone else to know about.