Before reading things you must know:

Conner is already born
The lost day has just happened recently
Buffy never moved on after angel so she never slept with Spike or Parker
and never dated Riley
Angel Moved on to Rebecca, Darla, and Cordilia
Willow had just recently become a Goddess
This is when the first is coming, but no beast yet, Cordilia is a higher
being but not the master of the beast yet
This is a total B/A

Full Summery: When the Scooby gang angel and cordilia betray Buffy,
they had no idea what they were doing to her. Buffy goes to train with
the master of martial arts, he becomes a father to her then dies before
her eyes and so does her son (Hint Hint the son of a certain dark haired
vamp that was turned human or one day). Then she learns about her past
and what she had done, memories and pain come a cross her from her past
and soon the burden that she must carry is worst than Angel's about
Angelus. Her heart turns to a solid rock that no one can get through.
Then one day when the beast comes no one can defeat it, have they ever
even defeated the Firs? They call for the a strong worrier not knowing
who they might get then a certain blonde slayer but now with brown hair
Shows up at the Hypernion one week later. What had she learned about
herself that made her so cruel and Empty? Will they save her from
herself? Can she kill the beast? And where has she been for the past 6
years? Just read on.

Disclaimer: Own nothing except the plot.