Imagine your OTP as teenage best friends who go to the same high school. Person A has very strong romantic feelings for B but would never admit it, and Person B finds a romantic partner, which makes A jealous. After a heated argument between A and B ("why are you so hostile around my boyfriend/girlfriend?") A finally admits their feelings to B. What happens next is up to you.
(Bonus points if they're both virgins and they end up losing their virginity to each other that night.)
