Ringworld is property of Larry Niven. All characters from the Buffyverse are Property of Joss Whedon. Everything else belongs to me.
Spike had his answer.
For the longest he wondered why he was pulled here. One moment he was in Los Angeles after the city had been rescued from a hell dimension then the next he was here on the Ringworld inside the Fist-Of-God Mountain in easy view of the newly formed Hellmouth.
The effects of the quantum entanglement generated by the Ringworld made sure that any closed set of particles had a zero net sum. Since the Buffy-Protector had pulled Buffy through time, the Ringworld compensated by pulling both Spike and the Hellmouth through time to cancel out the original arrival of the Buffy-Protector. The three of them constituted a closed system of particles. The state of any one of the three would affect the other two. Their destinies were entwined.
"But she failed." Spike thought as he examined the control board before him. His instruments had revealed that the Buffy-Protector had failed to pull all of Buffy through time but had instead pulled a copy of Buffy through time. Biologically both the original and copy were the same. The magic that made Buffy and the copy both a slayer was the same.
The only difference was how the Ringworld and the universe saw them.
The Buffy-Copy was not an original member of the particle set that brought Spike, The Hellmouth and the Buffy-Protector here in the first place. The equations had become unbalanced, had changed. The Buffy-Copy was a wildcard. Now all sorts of interesting possibilities loomed before him.
Spike placed any dreams of revenge in the back of his mind. After he had taken the tree-of-life fruit, the demon inside of him desired only one thing and that was protecting the children of darkness. Spike released a few hundred more hungry vampires from the Hellmouth into the Ringworld.
"That should keep her busy." He thought. "Let's see how long it takes her to move the shadow squares this time. " Spike watched them go.
His thoughts became dark and ambitious.
"One of these days I'm going to figure out how to turn off the sun without killing us all." Then it hit him. "The ultraviolet portion of the light spectrum is what kills us. All I have to do is broadcast ultraviolet light one hundred and eighty degrees out of phase with the incoming radiation to cancel out that part of the spectrum over an area three million times the surface area of the Earth in real time."
Spike began to run simulations. Calculating the individual vectors for the photons needed to cover the world was a task the Ringworld could easily perform.
Dawn was speaking with her husband.
"And it was like BOOM! The black hole came out of nowhere. I would to have loved to see Buffy's face!" Dawn said excitedly to the young man in the room. After being reconstructed from an exploded black hole Dawn went back to her quarters to freshen up.
The Map-Of-Mars had thousands of compartments. Dawn chose a small seven thousand square foot area to set up home. The compartment had a full living area, kitchen, bedrooms and nursery. Dawn was speaking to the young man in the room with her who was her current husband.
"There was a weird moment there, just before I entered the event horizon that I felt connected to everything in the Ringworld and beyond." And then Dawn said without missing a beat. "I haven't been home in days. Did you miss me?" Dawn walked over to her husband and then kissed him. She pushed him down on one of the overstuffed chairs and then straddled him placing her long legs on either side. She slowly started kissing the sides his neck.
"Oh Baby, I am so horny. You up for a round Acke?" She murmured.
He had grown use to Dawns kaleidoscopic display of emotion. That's how he could tell she was happy. Acke Andersson had been married to Dawn for over fifty years. He was happy, they both were very happy. Neither looked a day over thirty-five. Thanks to her obsessive sister Dawns family had some of the best health care in the galaxy.
After hours of lovemaking Dawn left the side of her sleeping husband to tip toe over to the nursery. She entered a warm dim room filled with hundreds of her sleeping children.
Dawn watched them sleep as a smile crept over her face.