A mother and her son are the only survivors of a plague. They live alone without any other human contact for several years, but when the boy turns 18 the mother re-assesses their relationship.
Dad whispered a joke in my ear, and Mom laughed so hard that she fell back. At this moment, my numb legs loosened, and my penis scurried out like a venomous snake, and happened to be pressed under her buttocks. It was terrible! Mom obviously felt it, and curiously reached out to touch it, and suddenly realized that it was my penis, and she retracted her hand. Mom's laughter stopped abruptly, and she was about to jump up in embarrassment.
My father was away on a business trip, so my chance came. I had to get my mother's body no matter what. After my mother fell asleep, I picked up my feet and slowly approached the bed. My mother was lying on the bed, with a blanket covering her chest and a purple cloth draped over her exposed shoulders.