One day, my father-in-law came to my house where I live with my husband. He had a fight with my mother-in-law, so I couldn't just ignore him and agreed to stay for a week. A few days later, when I went to my father-in-law's room to do the laundry, I witnessed his crotch swelling even while he was sleeping...It was bigger than my husband's, I thought, and I indulged in masturbation on the spot. However, my father-in-law had recorded the scene on his cell phone, and he said he would keep quiet, so he would only use his hands...only his mouth, and only 3cm, and he gradually began to desire my body...