While masturbating in front of his sexually frustrated older sister's shapely buttocks, he was instead aroused by her young penis, resulting in a deep penetration sex session until his testicles were empty. (Kato Tsubaki MRHP-052)

I'm a student preparing for university entrance exams, and I came to Tokyo. To save on accommodation costs, I'm temporarily staying at my older brother's house, but he's away on a business trip. Spending every day alone with my sexy, big-butt older sister has me burning with desire, and just when I'm about to reach my limit, I never expected that it would be the married woman who would get aroused first!