I'm sorry that I can't help you find this fic, but I wanted to ask if you're looking for the same story as this person:
http://www2.adult-fanfiction.org/forum/index.php/topic/34571-minotaur-mf/
If it is, then I suggest you keep an eye on that thread as well as this one, just in case someone does find this story for you guys. And then you can also let the other person know if someone gives you the link to the story.
If it's not the same story, then I'm sorry and just let me know, so I can remove this post.
But either way, happy hunting, and I hope someone can help.