Welcome to the forum! All kinds of fanfic ideas are flying around through here so don't hesitate to grab one and flesh it out. This is an intelligent place to be and reasonably civil so post as much as you want.
welcome to another person of advanced years.
Yay, we are secretly beginning to take over the boards - oh, well it was secret until I just opened my mouth, oops.
Check out the fan fiction here, many works of art try to continue the seriesis, serieses, serials hmm, Tales from serials of Buffy and Angels and their Friends.
While many examples of members writings seek and or give knowledge of what might have become, the wonderful Fan-Fic writers here pretty much cover most possible subjects.