Missionary, but at the edge of the bed with her legs up... Can work a lot from that angle.
My favorite is good ol' missionary. I like to have her legs over my shoulders or spread wide so that I can plow deeply and get all that she has to offer.
I love the sight of boobs moving during vigorous sex!
Duggy standing up is my favorite. But then I really love missionary with my legs spread or held wide open...hm, maybe that's my favorite.