Time to return the favor

Steven smiled at his little sis kneeling before him in her little short shorts, halter top and sexy pumps. Her amazing 37DD-24-35 body looked incredible as the young man admired her curvy form.

"Wow.....you really are pretty big." Cassey had to admit as she began to stand back up.

"Thanks..." he replied. "That was a great blow job. You really know how to suck a cock."

"Err...thanks." the 18 year blonde replied as she blushed at her big brother's comments. She looked over Steven's muscular, nude body standing before her and was impressed with what she saw. He was certainly built she thought to herself.

The animals, in the cages behind the young siblings, had quieted down as they watched the show Cassey and Steven had just given them.

"You know, Cassey, I'd like to return the favor." he said.

"What?" the innocent blonde asked not sure what her brother had in mind.

"Well, why don't you take off your clothes and I'll show you." he offered with a slight grin. The thought of getting his busty 18 year old sister naked, and going down on her, was exciting to him as he felt his thick cock already getting hard again. The pills he had been taking not only made him bigger thay also gave him great staying power and a very short recovery time.

Cassey bit her lip as she looked at her brother's massive cock hanging between his legs and considered his offer. She knew it wasn't "right' for a brother and sister to be doing these things but............

Does she do it?