If you're into Harry Potter and like Snape, please read my fanfic, Heart of a Slytherin! :)
Lysandra Blackwell is ordered by Dumbledore to become Severus Snape's spying partner, and they become unlikely friends. After the Dark Lord falls, peace resumes, but there are still Death Eaters on the loose, seeking revenge. Chaos resumes; the former spies must play the largest part in reestablishing order in their world. What happens when their hearts begin a very dangerous game?
And The Snake and the Lioness :)
After Voldemort falls, the Order remains to fight the many Death Eaters that avoided Azkaban. Due to the drop in numbers from the war, inbreeding among pure-bloods, the Ministry passes a marriage law. Severus Snape is forced to marry returning seventh year Ceridwen Sheridan to keep her safe from the Death Eaters. AU in that Snape and most of the Order are alive.