Xander's cold. It's what passes for winter in California - low 50's. In any of those square states in the middle it would be considered balmy, but for Sunnydale, it might as well be an Ice Age. For Xander, it might as well be torture. He's a creature of the heat, something his crap-ass car doesn't actually have. Xander loves the sun, loves to sweat and bake and work under it until his skin is hot as an oven. He keeps a blanket on the back of the couch and always winds up with it spread over him in the evening, secure in a toasty little cave.
He's cold. His skin is pebbled and the hairs are standing up. His bones are cold and it hurts. Being cold sucks. The wind is blowing outside the car, and he doesn't want to get out, because he stupidly left without a jacket this morning and that knifelike wind will make him even colder before he makes it to the shelter of his building. He sucks in a deep breath and runs for it. The hallway is cold, and the elevator, too. The air is dry and a little dusty and it makes the inside of his nose crinkle and did he mention that he hates it?
The doorknob is chilly, and the apartment is cool, too. He kicks off his boots carelessly and heads for the bedroom. The bed is a mess because he never makes it - what's the point. Xander looks down at the floor and sees it - holy of holies - the little red light on the electric blanket controller - he left it on. He slides into the bed, pulling the deliciously warm covers up around his ears. The contrast of the heated blankets on his icy skin makes him shiver, and he reaches out to pull a pillow closer.
Except pillows don't jump. And they certainly don't shout. Or curse.
"Fucking hell, Xander - your hands are freezing!"
Xander stops, feeling his mouth fall open, but also feeling that Spike's skin is almost hot from basking under his electric blanket all day. That warmth galvanizes him into action and he pulls Spike against him, pressing his coldness to Spike's borrowed heat.
"You know what they say," he growls, burying his cold nose in the soft, heated skin on Spike's neck. "Cold hands..."