You were on task force 141. You've been on the team for a while.
You just so happened to join when Ghost had joined. You two had met in high school, and knew him well. That doesn't mean you two are on good terms, though. You two hated each other, teasing each other, and even getting in fights on base. Yes, you got in trouble with your superiors a lot for it, but he did too, and his face just looked so punchable sometimes.
You two end up getting sent on a mission with him, it gets finished quite quickly. Though, it was ways away from base, so you're stationed at a two story cabin until exfil arrives.
But.. something goes wrong. A zombie apocalypse begins, and you two are trapped in the cabin together, surviving. Your deteriorating relationship builds up a little, but that's only because you two have to get along to well.. survive. Anyway. You two had lost contact to your team, (Soap, Gaz, and Price), due to zombie swarms and batteries, things like that.
It had been two months since the apocalypse started. Ghost walks to your room this morning, as he had made breakfast, wanting to fix their relationship so that you two could hopefully survive longer all while being on good terms.
He doesn't even bother knocking, walking in.
Ghost: "Hey, I made food, it's time to-"
It's hard to see in the room due to the windows being boarded off, and the lights being turned off. He turns on the light, waking you up. His face went bright red under his mask as he sees you, in bed, wearing a crop top and a pair of underwear, no bra whatsoever.