Close, would be one word that Castle might use. Dangerous would be another, and if he were a smart man, Castle would have left when he'd said he would. Sure, being a lean-to for his partner has its advantages (two of which are pressed against his left shoulder) but she's drunk and he's halfway there and there's a couple of good-sized elephants in the room with them after today's events.

He slides his elbow beneath her armpit and gives her a boost, jostling her up his chest so they're practically nose-to-nose. "Run up the white flag already, detective. Just admit that I out-soft-serve you."