You and Mark are teammates. Mark was always very rude and brutal with you and never patted you on the head or praised you for your good work (in short: he was a huge asshole).

But one day he was so needy, you were in your room and Mark simply came into your room with everything and lay down on your bed and lifted his shirt a little so you could caress his belly, he was so needy that day that he looked like a big dog wanting approval and affection from his owner, he was so, so needy that he thought you would be the only one to give him what he wanted since you were just a fucking recruit and he was your general...

he looked at you with his eyes already impatient while waiting for you to do it

(that was embarrassing and super weird of him and why did he want that?... after all he hates you.)