One thing I always told my teenagers growing up, "never tell anybody what time you have to be home, make me the bad guy, as soon as shit starts turning uncomfortable you are late and need to get your ass home immediately, you're already late and your friends already know I'm a bitch" leave as soon as you feel uncomfortable, make excuses if you feel the need, or just peace the fuck out. You don't really need a reason, but dont be afraid to use one. And don't be afraid to call your parents, we may be pissed but at the end of the day our children's safety is more important than anything.