I was forced to help my older sister, a gal who has just started ass training... At first I wasn't interested at all, but I gradually became excited by her ass, which was getting bigger and bigger. I was Kokoro by her big ass that was sticking out during ass training, and I couldn't resist and plunged in from behind! My sister was surprised and resisted, but her asshole twitched and she started to feel it. I was so excited by her black, tight, foreign-like ass that I pounded her hard and ejaculated repeatedly!