In British Columbia both text-based accounts (real and fictional, such as stories) and drawings of underage sexual activity are illegal (basically any sort of depiction, even if it just comes out of your mouth.)

So California is just starting to catch up.

All of Canada. The Canadian Criminal Code is federal.

I think they did carve out a judicial exception in a case where some guy was writing pure text stories for his own personal use, and didn't intentionally show them to anybody else at all, but I also seem to recall it was a pretty grudging exception for only those very specific circumstances.

Wrong country (at least for now...!)