Buffy goes to Ireland!

I'm none too particular on plot points, etc. However, what I would love to see is Buffy and Spike somehow drug into the fairy world. 

Use the seeley/unseeley courts of the fairy world. (Dark and light)

Possibly have a spell cast that turns the two into fairy folk of some kind. 

Big bad/ conflict is authors choice.

Spuffy love at some point, of course. 

Should not be a fluffy story. Fairies are much darker than some people realise.

I've wanted to do this for some time, but never been able to fully plot it out myself, not find the time to write it.