BuckTommy AU set around season 2 where they both attend the same gym and Buck Notices Tommy but because he has no idea that he’s bi yet he’s convinced he’s just super jealous
He becomes kind of competitive about his “gym rival” and is always trying to compete over how much Tommy is lifting or how fast he is running
Tommy has definitely noticed Buck Noticing him and is kind of charmed by the whole thing, he entertains it for a while, making the odd bitchy comment that spurs Buck to work out even harder and then eventually starts to engage Buck in friendly conversation
Buck practically starts wagging his metaphorical tail bc Tommy-from-the-gym is so Cool and it turns out he’s a firefighter PILOT of all things so they bond over the job and the shared connection to the 118, and suddenly they’re texting all the time too
They continue to work out together and maybe spar together because Tommy knows Muay Thai and offers to show Evan a few things, giving Buck some clarity on the new Feelings he’s having after getting up close and sweaty with Tommy, and maybe they have an almost-kiss moment
Then the ladder truck happens and Tommy sees it on the news.
