Snape Takes a Tull

The story of Severus Snape continues after the war, but in a very unexpected way. He lives in a mouldering manse, has a delectable live in nurse, and he's free of the Wizarding world. That is, until Kingsley Shackelbolt comes to ask for a favor from him for the last person he ever wanted to see again. Some smexy bits, but not too smutty. Also, some drug use and hard drinking.