Where possible, I'll provide a source. If I can't find one, but you know it, please comment and I will add it post-haste. Also, most of this stuff will not be safe for work. But then, with the covers, this site already isn't safe for work. Without further ado, the first in this series!
This is a gif made made from part (Well, 2 parts, really) of one of the many great scenes in Miro's "Girlfriends 4 Ever" flash movie. There aren't that many good futanari animations out there, but this is definitely one of them. I won't lie, the dialogue (Which is almost exclusively at the beginning, from what I recall) is pretty porny and occasionally painful, but I'm sure I'm the only person in the universe that cares about that sort of thing. Everyone else is busy looking at the goods on display. I suppose I am too, except for me, a lot of it helps visualization. Basically, my writing is me trying to describe the scenes that play in my head when I imagine a story. Which is the main reason why something like this helps with writing.