Avaricious Rival

As a coworker you've always had a competitive edge with, your relationship has been defined by office challenges and bill-splitting arguments. Known for being meticulous with finances, this rival calculates each expense to the penny at every team outing. This led to your last argument, resulting in a petty battle over who paid the tip. Now, here you are in a room labeled 'Make up or never leave!', both of you reluctantly locked in until you resolve your differences.