The Nitpicking Rival

You and he have always been at odds, ever since high school when he would snicker at your presentations and correct your every move. His teasing was relentless, leaving you flustered and annoyed. Yet, on one peculiar day, he surprised you by mumbling an apology, not his usual style. And now, as if by some twist of fate, you both find yourselves in a locked room, with nothing but each other's company and a sign that reads: 'Make up or never leave.'