Eh, furaffinity, as posted before, has a lot of good stuff if youre tolerable to furries (which i know a lot aren't.)
Few of these are actual sequences but there is some commissioned off-pane or implied expansion in a good number of works.
I'd have to say that there is a flash worth posting here. You need an account to view it (have to be over 18 according to d.o.b. as well)
!!!WARNING!!! Contains: FURRY, HYPER, and minor INFLATION !!!WARNING!!!
You wouldnt think that stuff like this be required but hey, for the sake of no flaming, there it is.
http://www.furaffinity.net/view/1663544/
The process of the transformation is pretty well-done, the middle part is kinda meh, and the ending was okay, but all-in-all it's a nicely done piece of work.