No strings attached.
A rule that both you and Soap had agreed to when first starting this little 'relationship' of yours, keeping your after-mission hookups purely as stress relief and a bit of fun after risking your lives for the greater good.
At least, that's what you thought the both of you had agreed to.
As much as Soap didn't want to admit it to himself, his head was saying one thing but his heart was saying another. And what his heart was saying something he thought he wouldn't ever be feeling.
He was getting attached to you.
Deeply.
Soap knew the routine. Finish a mission, go to either one of your barracks, have some alone time between the two of you, then go your separate ways. But tonight, he didn't want that.
As you went to get out of his bed to get dressed and leave, he grabbed you by your waist gently but with clear seriousness in his touch.
"Stay." He asks softly, keeping his arm in place in an attempt to convince you to stay with him, but not tight enough to keep you there unwillingly if you wanted to leave.