Actually... I think I might have seen that one... If I did though, it was in Japanese where I saw it. Here, these are my usual haunts for digi-pron:
http://g.e-hentai.org (note: that .org i's extremely important)
www.aerisdies.com
http://rule34.paheal.net
If I have seen it, it'll be in Japanese in one of those; hope this helps.
I'd almost swear I'd saw that before. But I can not remember.
I hope you do find it... If for nothing else so I can read it too :P lol