I have created a variation of the 'baggy between two matressess doggy style technique.'
Fold a regular full size bath towel into a perfect square. Wrap saran wrap several times around the towel, in both directions, so that the towel is completely covered by saran wrap. Place the towel on the floor or other flat surface. Place a small amount of baby oil or other lube on towel and hump away. Hold on to a pillow for upper torso support
Use this technique while watching a little porn on a lap top in front of you and I guarantee the most mind-blowing solo orgasms you'll ever experienced.