So here's the story...
We begining at the season 5 of Buffy the vampire slayer.
Dawn doesn't know who is she(I mean, she doesn't know that she was the key).
Buffy try to search with the scooby gang what's and where is the key.
Dawn become more closer of Spike, she's always search him when she's alone.
Giles search his book where's talk about the key, where is it, who is it and what she can do.
Glory came in Sunnydale.
Faith is back to see Buffy.
EDIT
An old prey of Spike come back in sunnydale: Trent.
Take care of you people! He's really dangerous! And you can't kill him, he was immortal.
Trent try to kill Dawn, but spike came help her.
When Spike try to kill Trent, Dawn told him to go away...And he goes away.
Trent is now alone with Dawn and bites her leaving her between life and death.
Dawn try to being safe by saying things maybe she will regret after.
So Trent will let her dying in her bedroom? Or keep her in his darkness and life style with him forever?
Faith is back in sunnydale too, in cemetery, what's happen when the two slayers will be in front of each other?
EDIT (19/08/07)
Now Dawn was a vampire and live in a cellar...Trent's cellar. He hide her here 'cause she promiss him to be his wife and Trent doesn't want that anybody found her and bring her back home.
Buffy and her mother found blood on Dawn's bed and don't belive in Spike...In fact it's not really that...They don't wanna belive Spike.
...
Spike: "I don't know why...She protect him"
...
What's happen next?