Ok, it's shame for me... Attention of the people to the that bat pony from "Accidentally" comic made me do that. If you guess her name, you will, probably find quickly her nsfw ask-blog on tumblr. Good luck!
It requires a lot of skills and awareness about anatomy. In fact I love to watch NSFW to learn difficult poses of bodies and point of views, it also can teach you some anatomy nuances. And you can fap on this of course ^_^