My sister, Sumire, just moved back home after breaking up with her boyfriend. She's always been spoiled and selfish, but she has a cute charm about her. Seeing her again brings back fond memories. When I went to call her to join me in her old room, she was masturbating while looking at herself in the mirror, moaning and breathing heavily. Her breasts were swaying. It was something I had never seen before... That day marked the beginning of my obsession with my sister's nipples. From then on, I helped her satisfy her newfound fetish by playing with her breasts and letting her ride my cock in our incestuous summer fling. Note that the contents may vary depending on the distribution method.