Hey, I did a search and didn't find this person so I figured I'd post it. I found this artist, Bacchanaliacorp on Deviantart while I was looking for a particular TG piece. While I don't think TG is her main focus, she has a few sequences and art pieces involving it.
http://bacchanaliacorp.deviantart.com Here's the deviantart profile.
And here's "Ball Gag," just one of a couple sequences.
http://bacchanaliacorp.deviantart.com/gallery/30309826