disclaimer I own nothing in the Charmed or Buffy franchises.
Just so you know I'm pushing the Buffy time line back so Becoming Part Two takes place in 2000.
Xander had made his way back inside the mansion just in time to see Buffy kissing Angel. "Huh, I guess Willow actually pulled it off," Xander said to himself. Just then Acathla's portal opened up behind the two lovers. Xander was the first to notice, and his gasp alerted the others. "Xander! What are you doing here? I told you to get out with Giles," Buffy yelled."I got him out, but I was worried about you, Buff." Buffy started to drag Angel toward the sewer entrance saying,"It doesn't matter now we need to get out of here."
At this point Angel stopped her pulling out of her grasp."Buffy no we need to close the portal," Angel said. Buffy turned around with tears in her eyes."But the only way to do that is to kill you. I wont do it. I I I can't!"
Xander knew she couldn't no wouldn't kill Angel, and what was worse Angel knew it too. At this point the portal was getting bigger and started pulsing with a sinister glow. Angel turned to the one other person in the room. Even though Xander and Angel hate each other, Angel had a great deal of respect for him. Xander saw the pleading in Angels' eyes and knew what he wanted. At that moment Xander couldn't hate Angel. It was impossible to hate someone that was condemning them self to Hell.
Xander reached down and picked up the sword that Buffy had thrown away. When Xander gave a slight nod to Angel telling him he was ready he kissed Buffy one last time, and shoved her to the side. Xander ran at Angel and ran him through.
Angel was lifted off his feet and was pulled backwards towards the portal. "NOOO!" Buffy screamed. Xander grabbed her before she could be pulled into the portal with Angel."I'm sorry Buffy, but know that it had to be this way and I will always love you," Angel said as he was sucked into Hell.
Xander let Buffy fall to her knees and knelt beside her. "I'm sorry Buff, but there was no other way." She was silent for a long time finally she looked up with bloodshot eyes filled with rage."Xander run. Leave town and don't come back, because if I see you again I will kill you," Buffy was practically snarling. Xander couldn't believe what he was hearing. Yes he killed Angel, but he told him to.
Buffy went to stand up and he stepped back. When she got to her feet she started to walk away. "Buffy wait! Angel wanted the portal closed and he knew you couldn't do it. I just did what he wanted," he tried to explain. Buffy spun back around and punched him in the gut sending him slamming into the far wall. Her eyes were cold, almost dead, as she said," I'm telling you one more time to leave. By sunrise tomorrow if your still in Sunnydale I will kill you." With that said she walked out the door to help Giles get to the Hospital.
Xander stood there shocked. What just happened? I helped save the world, again, and now I'm being treated like a demon.
As Xander painfully stood up he was wondering about where he could go. He had a little money saved up for his road trip he was planning on taking after graduation, but where could he go. I'll go to LA he thought. Its not to far and I should be able to buy a bus ticket fairly cheap. With that problem solved he ran home to pack.
He figured Giles and the rest of the Scoobies needed to know what happened, but with Buffy"s threat hanging over his head he decided to leave a message on Giles answering machine. After he left the payphone, he made the call with, he climbed in his bedroom window.
Xander grabbed two duffel bags and stuffed one with clothes and the other with basic essentials: toiletries, Twinkies, first aid kit, holy water, stakes, a couple blessed daggers, and a short sword. After he was all packed he pried open the loose floor board, and cleaned out all the cash he had.
He made one last check to see if he was missing anything, and noticed a picture frame that had two pictures in it. One of him, Jesse, and Willow and the other of him, Willow, and Buffy. He grabbed it and shoved it in the side pocket of the duffel bag with his clothes in it. Xander made his way downstairs ,one last time, making sure not to wake up his passed out parents. That was definitely one thing he wouldn't miss his drunk parents. He walked out the door and headed to the bus station.
At the bus station Xander had a dilemma. There were no buses leaving for LA till noon tomorrow. The only two buses leaving tonight was a bus to Las Vegas or one to San Francisco. While it would be cool to go to Las Vegas it would practically wipe out all of my savings. With that thought he bought the ticket for San Francisco, and ten minutes later he was on his way to starting his own destiny