[ If it wasn't for the enticing scent and the taste of blood that lingers in his mouth, Spike would've pulled back long before Jack had a chance to kiss him again. As it is now he lets it linger despite himself, entranced by future hormones and delicious copper and it takes a good few seconds before he thinks to make some distance between them.
He gives Jack another push backwards, roughly shoving him up against the wall before taking a few steps back. He wipes at his mouth with the back of his hand, gameface still firmly in place. It's harder to slip out of when the adrenaline is running high. ]