Well, I know a lot of you are kinda iffy on anything furry/anthro so for said people might have to avoid opening this link. If not, then I want to mention my good artist friend Rasp777 from FA. He's another great expansion artist and comes up so many oc's that I can't keep up in counting them. He does some great butt expansion so he is worth mentioning. Not only he does comic sequences but practices in some animation as well, take a look.
http://www.furaffinity.net/gallery/rasp777/