If you want to have a really fun time, watch her sucking another guy's cock, milking his balls and stroking his shaft, while you're fucking her from behind and then switch back and forth, playing Orgasm Lottery to see which guy comes where. It's my favorite with my wife, and I'll bet you two would love it, too . . . and we'd love to see the pix (or better yet, a vid clip).
Damon: You big dick lucky bastard!