I like to imagine that something along the lines of this happened after the Dragon Migration was over with.
Spike DID kinda spend his entire time there doing teenage dragon stuff rather than looking for the answers to the questions he had going into it, after all.
This is my first sappy comic, so I don't know how it turned out. I kept it black and white because I think my style of coloring is more suited to humor rather than seriousness. (Ha ha, yeah, that's it)
EDIT: Fixed the typo in the letter, thanks for pointing that out guys!
made a fanfic based on this! Go check it out! [link]