Use your other hand to finger your asshole.

You bring your other hand around underneath your back to give optimal access to the hole you're about to explore. You take the pointer finger on that hand and slowly tease at the opening. The pressure makes you pant, but you just fuck your pussy harder to distract you. You add more **** until it penetrates with a delicious sensation. You begin to slide it in and out, marveling and moaning at the feeling.