Title: forever young
Disclaimer: not mine
Summary: Xander is forever young
Just something that popped into my head. Unbeta'd and feel free to steal it if you want.
Takes place after sunnydale falls
Nobody really noticed at first, how he looked the same as he did in his sophomore year. He entered 12th grade still looking the same as he did the year he met Buffy. The year Buffy died is face was still fresh and unlined. The year the hellmouth caved in, his hair was still as glossy and bouncy as it had been all those years ago. A year after he lost his eye everyone was shocked to find it had regenerated. That was the first time they noticed something was "wrong". Of course this led to a massive research party. Giles took the watchers diaries, Willow searched with magic, Buffy beat up demons to get answers, but it was Dawn who caught the first clue. She'd been looking in her sisters 10th grade yearbook. She saw Xander standing with four strangers in the Sunnydale high school quad. Underneath the picture was written 'hyena pack'.
"Buffy, what's this?" asked Dawn pointing to the pic.
"Oh those are the kids that got possessed by hyena spirits in 10th grade, Xander got one too." Buffy said.
"Did you notice Xander looks just like he does in this picture?" Dawn asked.
This sent everyone on a mad search for anything about Primals and possessions. It was a year and a half later that they discovered the only person to survive a Primal possession was found alive 220 years after the fact. This person, a shaman, hadn't aged a day and was said to have regrown one of his arms.
And so when Spike showed up 30 years later, having somehow survived the fight in L. A. It was a fresh faced Xander who greeted him. The years had mellowed the fiery anger and the two were able to strike up a warm friendship. It was this relationship that kept Xander sane as all his loved one's aged and died leaving him alone except for Spike.