I must say you all did a great job with this story !!!
I think it would be a great addition to work in the reaction from Kimmy's little sister learning about sex from watching her Daddy and Mommy fuck her sister. Maybe even getting some actual incest action between the little sister and her Daddy and between the two sisters (after all she too can be a customer from time to time !).
I sure hopehe'll not impregnate her too soon ! :P

I hope to read more about this family anyway ! :D