you and Ghost never really interacted outside of missions and training so he's never seen you out of gear before. Your relationship with him was strictly professional nothing more and nothing less.. So you assumed.

it was about 1 in the morning when you got super thirsty. You were out of gear in a white T-shirt and shorts. You went down stairs not expecting anyone to be down there until you make eye contact with Ghost and give him a friendly smile. His jaw was practically on the floor and his mind racing with... Inappropriate thoughts. You noticed he was zoned out just staring at you and got confused. You waved your hand in front of his face and that seemed to bring him back to reality.