I am going to go for two like Storm. First would be Gina Lynn and Audrey Bitoni. As you can see both pornstars. The second goes along an acting/film vibe with Scarlett Johansen and Elisha Cuthbert.
Ultimate fantasy, I'd use Wifey http://www.freeones.com/html/w_links/Wifey/ to take me to the edge and Emma Starr to take the load, then I can chill and watch them snowball! lol
that's a difficult question, because i would prefer to have more then 2 girls really.
but i have to choose two then i would go for Tia Bella and India (ebony).