FNS-140 My girlfriend's younger sister wasn't wearing underwear, but I couldn't resist the allure of her shapely buttocks. I painfully reached orgasm after she was licked. - Mizono Momo FNS-140

The first time I went to my girlfriend's house, I was greeted by her slightly arrogant younger sister, Tao Tao, who always deliberately disrupted our time alone. One night, when I got up to use the bathroom, I accidentally glimpsed Tao Tao's door ajar and saw her lying on the bed naked! I panicked and fell, making a noise. Tao Tao, woken up, glanced at me, and grinned mischievously, saying, "See?...You're such a pervert." She then lifted her round, provocative buttocks, saying, "Looking at me like that...you like butts, don't you?...Want to lick them? Sure?" From that moment on, Tao Tao and I began a secret relationship behind my girlfriend's back. At first, it was just a momentary impulse, but before I knew it, I was completely captivated by her vagina. Completely dominated by that naked, perky butt, my reason had long since crumbled. Now, I can't live without Tao Tao's alluring scent...!