http://arania.kamiki.net/tf_main.htm
A comic author I like, she's not the best artist (although certainly not bad) but she's written a lot of comics, usually long ones with very good stories and a focus on the mental as well as physical changes.
Picture is taken from The Cabin in the Woods, which is now up to 276 pages with more coming all the time to give you an idea of how long her comics can get.
Focus is on furry tf, with M/F to futa being very common as well.