I had this scene pop into my head fully formed like a reverse Athena, so here you go. (It’s probably Season 5, but ???)

“Listen to me, Martin,” says Jon, kneeling beside Martin. “Nothing will hurt you. I’ll make sure of it, I promise.” Martin stays curled up in a ball and does not look up from where his face is stuffed in his knees. Jon reaches out a tentative hand to touch Martin’s knee.

“Don’t make promises you can’t keep,” says Martin, bitterly, oh so bitterly. Jon stops where he’d been stroking Martin’s knee slowly. He reaches out to touch Martin’s jaw, the side of his face, and gently guides his face upwards to look at him. All his eyes are closed now, and even his normal ones are brown again, only slightly flecked with green.

“I don’t,” Jon says.