Sort of futur-y Buffy

In 2014 Buffy and Spike has been appointed the guardians of a little boy who's destiny is to be the Peace bringer of our realm. The powers hand them this huge responsibility but then sircumstances demand the boy be sent back in time to save the world. And since Buffy and Spike cannot travel with him, their pastselves will have to take on the job, armed only with future memories..