I had a look at this website. If you scroll down the page I've linked here, to the bottom, there's a link called 'Other Heroines', click on that and go to page 9, scroll down to the bottom story which are sections from a Spiderman comic book (which I actually went out and bought to see how the story ended). It's called 'The Thousand'. Now its not exactly a bug transformation, but its kind of disgusting, how the guy starts of by eating the flesh from the inside and taking control of the skin. He eats his parents!
http://www.tgfa.org/comics/