Screw with them

You stop time and untie them. You strip both so they are completely naked. You take the blonde's dress and put it on the brunette, but backwards. You take the brunette's pants and put them backwards on the blonde but with the fly open. You take the blonde's panties and pull them down over the brunette's head and you take the brunette's panties and pull them down over the blonde's head. You then put the blonde's sunglasses back on so they are over the panties.

You restart time.

The girls realize something is on their heads. They take off the panties then stare at each other. The blonde realizes she's topless, and covers her breasts.

"How the hell am I in your dress?" asked the brunette, "and how did you get into my pants?"

"The fuck I know?" said the blonde. "Hand me your shirt!"

The brunette bends over to get her shirt.

You stop time. You strip both girls again. You sit the blonde behind the bent over brunette and shove her face up into the brunette's ass. Her legs are sticking between the brunette's legs, and you tie the brunette's wrists to the blonde's ankles and the blonde's wrists to the brunette's ankles.

You restart time. The brunette falls forward, her knees landing on either side of the blonde's legs. "What the fuck?!"

The blonde is staring into her friend's ass. "What the fuck is happening?!"