The father secretly held an 18th birthday party for his daughter, it was a girl's coming of age ceremony, but the girl wanted to go out somewhere else, but her father's persuasion made her and her lustful friends stay at the party and surprise her father, the secret was made public by the daughter because she was not her father's biological child so she was able to commit incest with her father, it was a gift she gave to her father on her coming of age ceremony.