Art by http://ctw36.deviantart.com/
Color by http://kimbawest.deviantart.com/

Another fantastic coloring job on another pic that's likely not as naughty as it looks.
I mean both Alvin and Simon (yes that is Simon) are clothed. Lingerie does count as clothing y'know and Simon may be in a female bodysuit anyway.
My take on it is Alvin having convinced Simon to don the female disguise for some wacky plan is teasing him for how realistic his disguise came out.
So there. :P

You can see the original B&W piece here.
http://www.furaffinity.net/view/14844307/