The technique written up in February about masturbation between two mattresses is a style I often use in hotels when away from home. On checking in at a hotel I am always pleased when I find out my room has two beds close together as I know I am in for some fun!
When horned and ready for final release I pull back the bed covers, get a small hand towel from the bathroom. I use the hand towel to make a nest between the beds, deep enough to take my hard pounding cock as I thrust between the mattresses. I don't use a condom, preferring to come into the towel.
Other times I use a plastic bag (sometimes simply the one the glass in the bathroom is protected by), put some lotion on my cock and place the cock into the bag before going between the mattresses. This feels so good - hump away until you come.
The pillow under the stomach works - I also sometimes hug a pillow as I thrust. You'll have a great orgasm. Now all you have to do is find two beds close together - enjoy!