HUNTB-158 "Sis, are you jerking off?" I thought my sister was masturbating with a pen between her legs while on all fours, but then she said it was lower body training and I was surprised.

When I got home, my sister was sticking a pen in her crotch? Shocked, she explained to me that it's training to tighten the lower body. But honestly, that look is just obscene! Unable to hold back any longer, I thrust right in! Her training had made her tight down there, and I came in no time! My sister seemed excited too, and instead of getting mad, she rode me reverse cowgirl style and inserted herself! With continuous non-stop internal ejaculation, sperm overflowed from her pussy!