He uses his left hand. Because of course he does. If he's going to bind himself to someone, to the man he loves, then he's damn well going to use his actual, real flesh and bone. It feels... weird to the touch. But this is important.

Once it's done, he reaches to take Adam's clean hand in his. All that's left to do is mark one another - hand to each others' face. And wait to make sure the Doorway arrives.

... hopefully the Pthumerian patron of promises won't be creepy. That would really kill the mood he's going for here.

"Get my good side... yeah?" Is all he can manage to say without getting choked up. Neither of them have to go through another separation. Even if they screw up, even if he screws up.

A deep breath. His expression all but shining in emotion, he presses his paste-covered hand to Adam's jawline. Like he's tilting him in for a kiss in the process.