“When I got close to my wife’s sister on a crowded train and got an erection, she fucked me even though my wife was there” VOL.1

On the train with my wife and her sister. A man feels his wife's sister's body during an accidental close encounter on a crowded train, and even though he thinks it's wrong, he can't help but get an erection. When the younger sister noticed this, a mischievous spirit grew in her heart, and she touched her brother-in-law's body to stimulate him without getting suspicious from her older sister. Then, I gradually became aroused myself and reached out my hand to my dick without my sister noticing.