Fic Search

So, I was watching this on YouTube, and it reminded me of this spander fic I read awhile back. In the fic Xander becomes invisible like Marcie did in 'Out of Mind, Out of Sight.' The others think he abandoned them, or that he died, or something, but Spike notices that there is someone else there.

I would really like to read this again if I can find it.

Thanks

Edit: It's Mister Cellophane, by amejisuto .