Hi,
All I can remember is that Buffy is in a Watcher training place, and they bring Spike in as a vampire informant. Buffy and Spike escape and the Watcher's building is attacked, turning into a massacre. Spike takes Buffy to a club (?) for safety; the demon that runs it is (maybe) Buffys father...

It could maybe be the world in between by Revello_1620

OK guys I'm deleting some posts because honestly they have absolutely nothing to do with the original posters request, nothing even like it. So the original posters query is getting lost. Please don't do that. Read the poster query and try to post fics fitting 'their' info:

1. Buffy is in a Watcher training facility.
2. Spike is there as avampire informant.
3. The watcher's facility is 'attacked' and there's a massacre.
4. Spike takes Buffy to a demon club to protect her.
5. Club owner might be Buffy's dad.

If you need more details then just ask, like was Buffy the slayer or a watcher in training?