Andrew suckled a little at Jack's tongue a little, shifting under him and very aware of his nudity against Jack's clothed body, the contrast just making him hotter.
He shivered again, Jack's thumb on his bare skin tickling him in a way that wasn't a tickle at all. He pushed his mouth to Jack's again for another more chaste kiss at Jack's reassurance and reached to pet through all that dark hair.
He wanted to say something witty and sweet in response to that, but what came out instead was something he'd said before, often, but which he meant to stand for all the duration of those million years. "I love you."