Sally is horrified

Your thrusting slows as you finish draining your cock into the slender young redhead. Grace writhes and bucks, wringing every last drop of seed and every iota of pleasure out of your thick cock, her gasps gradually slowing as her orgasms finally diminish.

When you pull out of her she gives a sated groan, curling up on the bed and rocking herself, purring contentedly. Her pussy oozes cream, and she looks the very image of a well fucked girl.

"Oh My God Grace!" Sally squeaks in horror. "You got his...his stuff in you! Oh My God! What if you get pregnant!"

"Mmmmm, it's ok," Grace answers with a happy murmur. "I'm on birth control."

"Oh My God! Since when? Does Mommy know!"

"Since the beginning of summer. When Lance and I started fucking, if you must know. Don't be such a dweeb Sally." Grace's voice takes on a tone of mild irritation as she glares at her sister, her fingers toying with a thin chain on her wrist, then softens again as she looks up at you.

"I came three times," she purrs. "Three times! And so hard! I've never come more than once, and never so good. Thank you...thank you sir." A happy little smile curls the corners of her lips.

"My pleasure," you smile, sitting on the bed and giving her a friendly pat on her sweet rump.

"Mmmmmmm, mine too," she giggles, then looks up at you with a more serious expression. "Can Sally go now sir? Please sir?"