Every day, my sister was immersed in club activities with morning practices and after-school training. That dedicated sister who had thrown herself into the club retired. During her active years, she used the club to vent stress, but after retiring, she often stayed cooped up in her room. Peeking inside, I saw her masturbating disgustingly and cumming over and over! Is her excess energy turning into unbridled lust? I sneaked a peek at my sister like that and got caught, so I hurriedly apologized, but she seemed off… It turns out her lust couldn't be satisfied by masturbation alone, and she unleashed it all on me! My sister, overflowing with energy and lust, made me sweat and cum over and over. My dick was put through hell by my sister who hates exercise and has below-average stamina… Cut it out already!
