Reverse bubble machine

Where you and hot chick are slaming ass ckeeks together and the chick has runny shit. You then proceed to fart into the runny shit creating shit bubbles. (Works with all genders!!!)

Person 1: I shouldn't have ate taco bell I have go take a runny shit
Person 2: Wait! I have an idea

Person 1: what is it hurry up
Person 2: lets do a reverse bubble machine