I’m of the opinion that Martin always found Jon attractive, but didn’t develop a full crush until after he let him stay in the Archives to hide from Prentiss. I don’t have any evidence for this, I just want it to be true because comedic potential.
Imagine with me the hilarity that would ensue after Sasha outs Jon as a decade younger than he claims and Martin has to entirely recalibrate his whole view of the guy. Cause he *thought* he was fantasizing about a workplace fling with an older coworker but this bastard is literally his age, he’s just got a grandpa personality. Tim would laugh so hard he would choke