It's been awhile since he happily kissed someone in full vampire state but somehow it feels right when it's Jack. Like it's easier to handle him when he got his fangs out, when it can still be justified as a byproduct of a fight. He hits the wall with a grunt, only briefly caught off guard by the kiss before pushing back into it with a fierceness that borders on brutal.
The taste of blood shoots like wildfire through his body, makes him forget everything that isn't the taste of hot iron on his tongue. Growling with pleasure he moves a hand up to fist in Jack's hair, the other sliding down between them to cup him roughly. Reminiscent of previous moments with them, only this time there's nothing around that could cut it short. Probably.