Like when we were little, my cousins kept rubbing their buttocks against my lap, and after I accidentally got an erection, I secretly penetrated them behind our parents' backs. SW-114

My niece and uncle came to my house during their holiday. The little girl, whom I hadn't seen in a long time, was still as cute as ever, calling me "big brother." And just like when we were little, she kept sitting on my lap and rubbing against me. This made me unable to resist getting an erection, and secretly, behind my relatives' backs, I just penetrated her!