[That reaction makes him drop the smile at first. Eyes closing, not looking, fisting hands? Jack is starting to think he did end up doing the wrong thing after all, because that's not how someone comfortable with a situation acts. But then Hiccup is joking too, returning the touch, and Jack can feel his control slipping. There's nothing wrong with making a bit more of this situation, right?

...Right?]

No need to waste your stick like that. One word and I'll take care of them like I did with your cousin.

[His eyes follow the tongue and he gulps - there's this huge urge to jump and take those lips for his own, and considering how he's about to lose it, he would've done just that, but there's a little thing stopping him.]

...you're trembling. [His hand leaves Hiccup's cheek to hold the hand cupping his, fingers closing softly around Hiccup's, trying to be comforting. Jack could be an egoistical shit sometimes, but this is his best and only friend and the only person he puts above anything else. Above himself.] I don't want you to be uncomfortable. Should I stop touching you?

[His voice breaks when he asks that, his insides turning, the fool side of his brain protesting about that offer. He doesn't want to stop touching Hiccup... but he wants to lose him even less.]