My sister usually walks around the house in a carefree manner. As a teenager, I find her stimulating and sometimes see her as a woman. One day, my sister started working at a men's spa! She asked me to be her practice partner, and I thought, "Isn't this an erotic thing?" I got a full erection as she massaged my perineum flexibly, and her body line was clearly visible in the lewd treatment wear. She then warmed up my cock with her hands, and I leaked precum. My sister also got horny, sucking my shaft and balls, making it sloppy with oil and saliva! Then, she finally inserted it and even did cowgirl! All of this was just practice... the massage became intense afterwards! The taboo relationship with my real sister! The thrill of keeping it a secret from our parents, my sister's improving handjob skills, and our insatiable lust, we both came over and over again! Today, I felt the ultimate ecstasy while having my pleasure points massaged.