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You wake up in the middle of the night and he's standing there in a hotel robe watching you. He says he can't sleep and you're drowsy so you can't tell what he wants until you notice he's playing with the hem of the sheets. He would already be in bed with you except he wants to be invited. You roll over and pull back the blankets. His robe is tossed on the floor and he slides in next to you.
He scoots back against you, and your hand wraps around his waist. He's naked. And that wouldn't really matter because it's familiar and telling AJ to put on clothes is always futile, except you're naked too and if someone saw the two of you like that it could be construed as something. You haven't had something with AJ since you married Kristin.
He shifts a little and mumbles something into the pillow that sounds like "I miss you." You kiss him on the back of his head because you miss him too, and if you didn't kiss him then, even only in that friendly, comfortable way, you would lay awake all night thinking about kissing him other places.
The next morning he's gone when you wake up, but he smirks at you when you meet up with him at breakfast and he asks how you slept. The others haven't come yet so you could kiss him again, this time with your bottom lip grazing his labret piercing, and no one would know. But you don't, because that would mean the two of you still had something.