When I returned home for the first time in six years after getting a job and starting living alone in a rural area, I found that my younger sister Rin's breasts, which were once small, had grown into huge breasts. Rin sees her father masturbating and learns that her mother doesn't let him have sex with her, so he feels sorry for her and decides to do something that feels good for her instead of her mother. She insists that she can touch her breasts as long as it's hers...
