It's the end of the world... unless Buffy and Spike have sex in order to stop it.

At the end of Something Blue, Buffy and Spike decide to pretend that the spell hasn't broken for them.

It was the best of times... No, it was the bloody pits. Spike had neve had a worst summer in his entire life and unlife, combined.

Not until next year, at least.

After the events of Hush, Spike sees Buffy captured by the Initiative. When her friends refuse to listen to him, he decides it's up to him to rescue the Slayer. She's HIS archenemy, after all, and no one else gets to take her out.