Spike's having trouble catching his breath as well, which is saying something, seeing as he doesn't actually need to breathe.

"Pretty much sums it up," he says. He kisses the top of her head, then just stays there, breathing in her scent. He smiles. "You're not running off."

Wait, he definitely didn't mean to say that out loud. He hastily adds, "I mean, I didn't think-- we're different now, I know that. It's just... nice." He hugs her closer with his arm. "I could get used to this."