I'm searching for some Japanese show.
A father and his daughter would participate.
The father has to fuck 1 of 4 girls and he ends up fucking his daughter.
He doesn't stop after they tell him it's his daughter.
You know it doesn't end with father/daughter on that show. Mother/son, brother/sister Son/Mother/Daughter. It gets very kinky, however, this maybe what you're searching for: https://www.bing.com/videos/search?q=incest+gameshow+japan&FORM=HDRSC3