My first sex simulation with my big-breasted and kind sister-in-law, who just found out that I have my first girlfriend! - My sister-in-law taught me the process of insertion, as I had no experience in kissing and had never seen a pussy or breasts before, but I was still nervous.She promised me, ``You can insert it only once,'' and she only inserted it once. - I saw that it felt so good to insert it into a real pussy, even though it was only one round trip, and before I knew it, I was shaking my hips several times! - My sister-in-law, who was completely in heat, asked for my dick and made me cum repeatedly.