和谐家庭9.0

Teenaged siblings Girly and Sonny lure young men back to their home to meet the eccentric Mumsy and Nanny. There, the men are forced to take part in strange games, the rules of which are never defined - and if they refuse, or transgress the unwritten rules, they're killed. But they may have met their match in New Friend, their latest victim, who starts to manipulate the foursom...