Kylo can't help but turn to look away with the combination of her comments and the hand on his own, and though his fingers curl in slightly, he doesn't pull away. The most he does is bring his shoulders up slightly, as if to defend himself against the sheepishness. (It doesn't work.)

Really, the main thing to it is the declaration that he knows her. Even though he's aware that he knows her better than most people, logically, oftentimes he still doesn't feel like he knows enough. He can't predict what she'll think or what she'll do. It makes him uncertain, especially with more personal things like gifts.

He presses his lips together and mumbles a response.

"Well, what are you waiting for?"