I no longer remember who pointed me towards the following fic. It's entirely possible someone rec'd it here. If so, apologies to that original poster and consider this a second endorsement for this fic:
The Birthday Present by excessivelyperky
http://www.fanfiction.net/s/2470334/1/The_Birthday_PresentVERY long gen fic, Snape-centric and Slytherin POV of events post-OotP, and completely disregards HBP and DH. I spent 2 1/2 weeks on this fic so be prepared to give up your social life for the duration! Very compelling story with just a hint of future SSHG if you really pay attention.
I'm primarily a Snape/Granger fan, a pairing which is rarely represented in Friday recs. I've never seen discouragement for SSHG recs here, but please correct me if I'm wrong. Here are some of my favorites from last winter's SSHG Gift Exchange:
The Life Unlived by sshg316
http://community.livejournal.com/sshg_exchange/153466.htmlHermione experiences visions of a different life. Includes a very different backstory for Severus.
Harbinger by bambu345
http://community.livejournal.com/sshg_exchange/145045.htmlMysterious happenings at Hogwarts. Harry and Hermione, now aurors, must investigate. A very unique Snape Lives premise.
The Marriage Benefit (or) How Granger And Snape Buggered The Ministry, The Board Of Governors, Minerva And The Entire Hogwarts Staff Whilst Finding True Love by miamadwyn
http://community.livejournal.com/sshg_exchange/148098.htmlA new teacher's salary compensation causes Severus and Hermione to join forces.
Note: For some reason the links didn't work, so I've added the urls for each fic. What's up IJ?