Kiwi Farms

Here's yet another fucked up fetish on Deviantart. Basically, TF generally refers to Transformation, which is "art" where people turn into anything from furries to ponies to even inanimate objects like vehicles. This is something they actually get off to
Here are some TF stories
http://pokemon-tf-fan.deviantart.com/art/Flygon-TF-140381796
http://metalhead616.deviantart.com/art/Cat-TF-2-136745561
http://heavensshadow.deviantart.com/art/Centaur-TF-Story-206564284