Spike wraps his arms around her and hugs her back tightly. It's more comforting than he'll admit, being this close to her. Her heartbeat, her warmth, how completely alive she feels, it's a good feeling. That and her scent, overpowering everything else when she's this close.

If anyone else asks, he's just being here for Buffy. If it's also helping him deal with things he'd rather deny bothered him to begin with, that's nobody's business.