"This person is my mom's remarriage partner," I thought. While having a home drinking session to get closer to my mom's remarriage partner, I somehow fell asleep. During that time, it seems they were getting intimate, and I was shocked to find my mom sleeping naked! Since she said she had no clothes, I lent her my shirt... but the way her breasts and panties peeked out from the shirt was too erotic, and it made me hard. Realizing this, my mom didn't back down but instead got into it, straddling me and having sex with me in the heat of the moment.