The first time I went to her house, I was greeted by her younger sister Momo, with her cheeky, devilish smile. She would mess around with me, as if to interrupt my time with her. One night, after going to the bathroom, I happened to find Momo's room open when I came back and... to my surprise, she was lying there without any panties on! I tripped over in a panic, and when I heard a noise, Momo woke up, glanced my way, and grinned. "You were looking, weren't you?... I'm naughty," she said, sticking out her firm buttocks and seducing me. "You're staring at me so much... Do you like my butt?... I don't mind if I lick it?" From that moment on, a secret relationship between Momo and I began, hidden from her. At first, it was a whim, but before I knew it, I was hooked on her anal. Controlled by that pantyless buttocks, my reason collapsed. I could no longer live without Momo's anal pheromones...!