It starts with a little girl who is bitten by a werewolf. She's afraid at first, since the wolf is standing there with a huge grin on his face...then she starts gaining tons of muscle while changing into a werewolf herself. Towards the end, she starts revelling in her new muscle mass...until she looks at the wolf and sees just WHY he changed her. He's sporting a huge boner for her. It's done by a japanese artist, so it counts as a manga. Never ran in any comic as far as I know. I saw it online back in like 2003 at fchan. Anybody have it or know where to locate it?

Is this the one you're looking for pool #3273

No, sadly. It had MUCH better art, no videogame characters, and was only a couple pages long.

No, I don't know it off the top of my head. But if it's been uploaded here then you should be able to find it somewhere in here: https://e621.net/post/index/1/transformation%20canine

Maybe someone else will recognise it, but in the meantime good luck in your search!