GAID-025 Dad what is sex?

"Rio-chan" lives with her parents and grandfather. She has a problem that she can't tell anyone. That is, the relationship with my grandfather only happens when my parents are away... Bathing together and touching her body, being served in a futon... Her immature body is being played with. I'm afraid my grandfather will change suddenly and I can't talk to anyone. Help me...mom...

GAID-025 Dad what is sex?