'The Ice Creamdom' has a storage freezer; go lock the girls inside...
From Create Your Own Story
Terry comes back from her break cheery as a bird which of course draws the ridicule of her abusers, but they can't seem to wipe the smile off of her face. While they are busy insulting her you manage to sneak in through the side, and with a hard swing of a napkin holder, knock Roquelle unconscious. The other girl starts to scream but Terry slaps her big sausage fingers around her mouth, dragging her kicking and screaming into the freezer. You punch Becky hard in the stomach which stuns her long enough for you to zip tie her hands behind her while Terry closes the store and pulls down the big steel shutters, placing the 'Under Matanance' sign out front to discourage customers and security. You stuff a dirty cleaning rag into Becky's screaming mouth and tie it back with a plastic bag, doing the same for the just coming around Roquelle, head bleeding from your assault. Terry gets back by the time you are done, closing the freezer behind her, alone with the two bitches and you.
She stands there a moment, not really sure what to do, clouds of frozen breath floating in the air. The two bitches squeal behind their improvised gags, squirming against the cold metal. At first you think using Terry was a mistake but when Becky tries to stand up she plants a big sneakered foot into the girls temple. Maybe this wasn't such a bad idea...