My sister, who has yet to experience orgasm during sex with her boyfriend, buys a dildo online and tries practicing vaginal orgasms. The sexy voices coming from my sister's room... I sneak a peek at the practice scene and it's so erotic that I end up masturbating and my sister finds out! Then my sister comes up to me and is surprised at how similar the dildo is to my erect penis, and asks me to try it! My sister has her first vaginal orgasm with a raw penis. She even says, "You can cum inside me," and I experience my first creampie!