On a carousel horses race around and around in circles, but they never reach the finish line that they appear to be racing toward.
Write a story about two people who are stuck in that race. They are friends or enemies or frenemies who are constantly competing for something that neither of them could ever acquire.
Do they talk about their competition, or is the competition unspoken? Do they talk to they have friends and family who support them in the competition, or do those people think that the competition is petty and stupid? Over time, does the relationship between the two become friendlier or does it polarize them?