Her begging had the reverse effect as she wanted. Turning me on even more and causing me to fuck her faster. My legs were shaking and I was breathing through my mouth as the sweat poured down my chest and I felt my balls tightening, getting ready to release their contents.

"A little more!" she moaned, "Just a little more! Please, baby? Auntie will give you a treat!"

"I...Oh!" I moaned as my cock twitched. "I...I'll try."

"Shove your cock in my ass!" she yelled, "Put that big fucking dick in your Aunt's ass!"

I stopped in mid stroke wondering if even she were that dirty. Auntie pulled her pussy...