I liked the latest installment.

I realize now that I slightly misunderstood part of the contract that was signed, wherein people wouldn't remember his transformations. That makes for a lot more flexibility in your stories, and also brings up a few interesting questions about what sort of weird reality-altering is going on.
I'd like to read a bit more detail in the transformation sequences, but overall these are some of the most enjoyable tg/tf shorts I've read lately.