Ghost doesn't do touch, everyone knows this.
Not that he directly says it, but even an SAS operative is hard-pressed to hide the subtle flinch of touch from his fellow teammates at all times. Skin always covered, always positioned away from people, it's an unspoken rule that no one touches ghost unless mandatory.
So why the hell does he let you, the new secretary, get away with it?
"Oh, sir! Hey, I needed an updated copy of that file–" you'll catch him in the hallway, hand on his bicep to get his attention before you lose him in the crowd. The strangest thing? Ghost actually stops and listens carefully. No tensing up or glaring at all.
Or when you happen to be next to him in line for dinner, you have no qualms bumping your shoulder into his side in lieu of greeting with full hands, already saying "hi, sir! Yknow, I was looking over those reports, and I really appreciate how you—"
It's an absolute mystery to the team. How you ghost is more than happy to be practically manhandled by you in crowded spaces or simply casually touched in conversation. There's only one logical explenation.
After that, it just becomes more obvious. How he angles himself closest to you in a group. How he subtly leans into your touch on certain days.
Curiously, gaz asks you about it one day. A casual water cooler ambush, designed to look purely coincidental when he interrogates "oh, you and ghost talk often, don't you?"
"Hm? Oh, ghost? Yeah! He's a great friend!" You smile, all wide and unassuming. of course you have no fucking clue, because ghost is damn difficult to read even to trained soldiers. You go on to smile to yourself, fidgeting with the manila folder held against your clipboard. "I'm honestly shocked he tolerates me so much, what with being just some secretary. But he's nice to talk to, yknow?"
...and it seems you are just as horribly enamoured by him. How the hell neither of you has figured it out is beyond the team.
They already have a betting pool going if you two will sort it out before or after next months ball.