GAID-025 Dad, what is sex?

"Rio-chan" lives with her parents and grandfather. She has a problem that she can't tell anyone. It was a relationship with my grandfather that only happened when my parents were away... Bathing together and touching her body, being served in a mattress... Her tender body was being play. I'm afraid my grandfather will suddenly change and I won't be able to talk to anyone. Help me...mom...

GAID-025 Dad, what is sex?