The empathy bond doesn't require skin contact to be set off, in fact it tends to be stronger with intimate connections, so at a point in their special way of kissing his own desire starts to bleed through to her. He's usually a very calm and steady presence but he's keyed into her enough to drop some of that. He's so focused on what they're doing that he almost misses her stopping, just barely managing to push through the fog of want to realize if he tried to lean forward in that moment he's actually going to kiss her. He does manage to focus though. Somehow.

She is a little too close on his lap and he's trying not to think of that, resisting the urge to move up toward her, to spur this on. Cobb's hand had almost started to wander from her back to her front, rising up her stomach, but he stops it now, dropping it to her back again. He looks up at her and she's close and beautiful and there's an undercurrent of longing to his lust. It's fine. He's got this. It's not as if he thought kissing through a shirt was going to be erotic, alright. This is new territory.

Did they have to stop? That's his question, but obviously she thinks they did, so probably, he's not thinking clearly. Cobb nods in vague understanding. "Alright, yeah, yes." He's not disappointed or anything, but it's just been awhile since he's been hit by lust like that. "I can't even imagine what skin kissin' would do to us." He's pretty positive they would be completely lost in it, and it's not that he doesn't want that sort of blind passion, but rather he's adjusting to the concept of being with someone who spins his head like this.

"Don't worry, the dragon's reined in." This is just to tease her, to let her know they're fine and he'll always find a way to joke when things get tense between them.