Looking for fic recs where the key is not a teenage dawn, but a younger version. Could be Buffy's baby or sister...I really want to see Spike and Buffy working together to protect her.

Normal by Kari Mouke
http://web.archive.org/web/20040813163029/www.thetwojanes.com/photo_3.html

Unexpected by Passion4Spike
http://dark-solace.org/elysian/viewstory.php?sid=2991

Both feature stories where Buffy and Spike get together earlier and Dawn as Key is their Daughter.

On this site:

The Protectors by SinisterChic

Summary: The monks gave Buffy and Spike one night of fake memories. That would have been enough to change their lives. But when you add a glowing key in the form of an unborn baby, well . . . things wouldn't just change, they would be turned completely upside-down

On this site:

The Protectors by SinisterChic

Summary: The monks gave Buffy and Spike one night of fake memories. That would have been enough to change their lives. But when you add a glowing key in the form of an unborn baby, well . . . things wouldn't just change, they would be turned completely upside-down

I absolutely love this one! Dawn does not belong to Buffy, but she and Spike have to work together to first find Dawn, then protect her in order to avert the apocalypse. It should fit your criteria!

Dark Prophecy by Pipergirl
Summary: Buffy and Spike must put aside their differences to find a baby whose sacrifice will bring about an apocalypse (yep--another one). This will be an adventure that will test their mettle and help them learn about each other and--most importantly--about themselves. A Slayer who's afraid of flying, a vampire who's afraid of... well, he just won't say, and a few really colourful characters will hopefully keep you entertained.