After the long build up and the denied climax inside her pussy, after the carefully slow preparation of her pliant ass, Kat's lustful words unleashed Ben's bestial need to just fuck and cum. His vision was blurry and his heart was drumming madly in his ears as he withdrew almost all the way out of her slippery asshole and slammed back in again. Then out, and in again. And again, to the sound of his sister's loud moans. Faster. Harder. Deeper.

The more he fucked her ass, the more he wanted to assfuck her. His perceptions were focused completely on the squeezing, warm snugness of Kat's rectum. He lost himself...