Somewhere in the underground of his thoughts had been one adamant vow: no touching Buffy, no coercing Buffy, no forcing Buffy, nothing, not after what he'd tried to do to her before. No assuming he was allowed to...anything, actually. Even if she was holding his hands, it'd been her instigation. Any physical contact had to stay at her instigation, period. Not his.
Adamantine the vow might have been, but it still melted in the face of her tears.
Cautiously, giving her all the time and space she needed to pull away (as though she weren't entirely capable of kicking his arse if she did object, but that wasn't the point), he wrapped his arms around her and rested his chin on top of her head. He wasn't assuming it meant anything, truly. It was just as simple as Buffy needing comfort and him being around to offer it if she wanted it from him. Even if he couldn't imagine why she would. "I won't," he said quietly. It wasn't a hard promise to make. He wasn't sure he could leave her. Not without coming back, at any rate.
He always did seem to come back to her, one way or another.