My step-sister, born from my parents' remarriage, is incredibly promiscuous! When she found out I was a virgin, she thought it was funny and started playing dirty tricks on my dick! Of course, the virgin dick gets hard! But she always stops at the last second! She won't let me cum! One day, when I woke up, my sister was straddling me while naked from the waist down doing bare crotch grinding!? Unable to hold back any longer, I forcefully thrust my hips and penetrated her! I came inside her in an instant! My sister also felt good, saying it wasn't enough, so we did it multiple times!
