Watching the smiling, teasing younger sister as she slips into her vagina, her panties causing reason to fly away and a frenzied, violent thrusting ensues. (Arai Rima MIAA-810)

After my parents remarried, my new little sister, "Rima," was cute and well-behaved, but she unconsciously exposed her thong, making me frantically thrust towards her buttocks, wanting to bite it. She would also spread her legs in an M-shape, revealing her little pussy! I couldn't resist! I pulled down her pants, forced my way in, and ejaculated! From that day on, my sister started teasing me with a sly smile, making me increasingly aroused! We did things together, pulling down each other's thongs, caressing and teasing each other, swaying like little devils, and thrusting violently, finally ejaculating!