She rubbed and pushed me down, ejaculating inside me, onto the unsuspecting older woman who showed me her black pantyhose. (Tojo Natsu DASS-231)

My sister and I live together. Every time she comes home, she takes off her suit and wears only black pantyhose, living a carefree life. Actually, I sometimes feel aroused by my sister's underwear and buttocks, but my lazy sister doesn't seem to notice. One day, my sister fell asleep from exhaustion, still wearing pantyhose but no underwear. I couldn't resist the sight and assaulted her. Surprisingly, she didn't resist; instead, it seemed she wanted to use my penis to release her pent-up sexual desire…!