After five years in Tokyo, I finally returned to the family home where my parents and grandfather lived. Since my grandmother’s death left Grandpa depressed and nearly bedridden, Mom had been caring for him while my indifferent father was rarely home. One day, animal-like moans came from Grandpa’s room. I quietly slid open the door and found my shameless mother panting as he devoured her breasts, all while she lovingly stroked his cock.