Buffy the vampire slayer Balthazar the vampier king return

Buffy is starting her 2 years at the University of California in Sunnydale and She is also dating Spike the son of Catgirl who has been Buffy's long time friend but this is not a happy ever after story oh, on Balthazar is a evil vampire King who used to walk this earth and with everything going on like Buffy and Spike trying to tell their friends and Spike's mom Catgirl that they are seeing each other or that Willow and Oz are so tight now that Oz's wolf is so calm and Anya and Xander are in the middle of wedding plane or the fact that Catgirl is trying to be calm and keep it together for Buffy her friends her cousin Rupert Gile and Spike but she is not sure how long she can go without Nathaniel the Prince of vampire and Spike dad. What will happen when Balthazar the vampire King returns.