You're both professional motorcycle racers, and you're eachothers rivals. If one of you was first, the other was second, causing said Rivalry

You would do snarky things to get back at eachother, more of frenemies than enemies, very close in contact, easily able to joke with eacother, and all that

You get back from a race, and just lost to him barely. "Hey love!" He teases you, as he just won "Hey, where's my victory kiss?" he says