My mother remarried and my younger sister, who is close to my age, came to live with us. One day, my experienced sister found out that I was still a virgin and started teasing me with her panty shots... On the day my parents went on a trip, my sister tempted me with her panty shots as usual and I couldn't help it... My sister was panicking and saying something, but I couldn't hear her at all so I inserted my raw dick! I didn't notice when my sister came and I kept inseminated her with my wild pistons and kept cumming! "I won't tease you anymore, so don't thrust any more!!"