The prostitute taught her younger brother to do that

When my parents are away from home on vacation, my stepsister and I stay at home and do activities together. Ms. Mirai is a person with a high sexual desire, she often talks about adults in front of me without hesitation. Obscene words always flowed from her mouth as if she was trying to seduce me. That night she snuck into my room and said she wanted to teach me how to do adult things. A guy like me who hasn't experienced life yet is extremely curious when he hears her seduce her. And then…