I had been living alone in a dorm near college when I returned home for the first time in ages. My parents and grandfather lived there, and since Grandma died, Mom had been caring for him after he became bedridden. He constantly summoned her with a faint voice and made her tend to his every need. One night, strange noises came from his room: low groans mixed with a woman's sweet moans. I quietly slid open the door and found Mom writhing with pleasure as Grandfather sucked her breasts...