Ah I was wondering if Clown TFs would ever get brought up here, and while they certainly are weird, weird can be good.
A few months back I started to get real interested it thanks to some folks on my RP site, so I started writing a series of Clown TF stories.
http://darkdonny.deviantart.com/gallery/#Clowntopia
If you are interested, fell free. If not, rest safe. The clowns won't eat you tonight, I promise.
Three stories are there, The Storefront, The Photo-Shoot (a personal favorite of all my writing, actually) and the multi-chapter story Prom Night. (Note: Storefront and Photo-Shoot are entirely Female TF Process, but Prom Night has Female and Male process, just so you know)