There's a new bimbo TF up at Transformed.to site. How do I know? I actually commissioned this particular one. It's a studious mousy girl to bimbo TF of Jolene. I'm obviously a bit biased on this one, but I think it's a well done and Jolene does a good job working off of my rough ideas.
http://vidown.com/cgi/store2.pl?site=transformed.to
He's also open for commissions and while not exactly cheap as you might imagine, he charges a good rate I feel. So I recommend it!