Grab the bedframe and use it for leverage to push back at him when he thrusts. Really, the sexiest thing you can do is enjoy it. Pay attention to how they react to your moves and go with the flow. Exercise your PC muscles by doing Kegels to last longer. Play with his nipples if he's at the right angle to get to them, also if you are short enough you might try sucking them.
Proper Hip Movement In Bed
You may find it helpful to have a pillow under you in this position. You can also touch your own body. All of these things will change angles, tensions, shapes of orifices, and so on. Are you enjoying what he's doing?