The Ass-assin
She turned around, presenting her ass towards you and pulling her cheeks apart. "Well... get to work. Don't even think about touching my pussy..." Oh... wow... Strict rules, but you were willing to play by them.
You did your best as your tongue plunged into her asshole. Seconds turned into minutes turned into, well you weren't quite sure how long. You began to stroke yourself as you licked, and she either didn't notice or didn't mind.
Finally her head sank low and her moaning increased. She was close. That gave you all the motivation you needed to speed up the pace. You managed to push her to climax as her weight shifted back against your face, her ass surrounding you as she pressed your tongue in deeper. "Oh fuck..." You suddenly realized how wet your shirt was as you pulled back and began to catch your breath.