I can think of three artists:
First would be the easest to get into contact with:
http://www.furaffinity.net/user/speeds/
Examples: http://www.furaffinity.net/view/25418567/ http://www.furaffinity.net/view/25419795/
Prices: http://www.furaffinity.net/view/26290714/
Second is someone that i used in the past but is hard to get in touch with and english is not their first language
http://www.furaffinity.net/user/bermasin
Example: http://www.furaffinity.net/view/23025867/
Prices: on their profile page
Last is someone that mieght be willing to give it a try but unsure. May also have to wait as due to life they are taking a bit longer to do their commissions
http://www.furaffinity.net/user/evil-rick/
While they may not do the art themselves they do get a lot of commissions that are what you want so may be able to point you to someone
http://www.furaffinity.net/user/dyveira/

Hope this helps (one of my fav kinks myself)

thanks for the listings! ill check em out and see how this goes! :)

i mean. id be up for going halfsies on this if you find someone o3o, and be the one getting stuffed x3

<3 Do you have any recommendations pup? :3

I like attention. o.,o

like what kind? >u> *squeaks*

You know I'm always willing to try :>

tempting my friend, very tempting <3

Did some jiggly butt cheeks get your attention? :p

not exactly....just more lewd imagery of the twins.....having their way with psy as usual @///@ huff~

You know I'm always up for working with ya Psy :D Just gotta hit me up with deets and I'll do whatever ya want ^_^