Era adolescent hardcore film scenes

Cute little teen wants to know what's going on. She's caught by her dad's assistant spying on her. Then her stepdad joins in and they all try to sabotage her situation. But it doesn't work out, she gets down on her knees and accepts the cheating. While she's having a drink at the bar she sneaks into the guy's room and his partner is there too. This fun little lil' game turns into a full-blown family fun!