Kyota's mother died of illness two years ago. Since then, my grandmother, Akiko, has been doing housework and living with the three of us. Not wanting to make her feel sorry for her mother even if she wasn't there, Akiko worked hard to do housework. Kyohei, who was a grandmother when she was a child, invited Akiko to go on a hot spring trip. Akiko, who saw her grandson's big dick on that trip, had a dick aching for the first time in a long time ...