Something hardcore

"Why don't we finish this in my office." You suggest.

"Yes sir." "Yes Daddy." The girls reply in unison.

The three of you get up and leave the bathroom which the twins have spent almost their entire day in today. You double check that the way is clear before leading the girls through to your office, confident that no one else is in the office at this time and that it'll be a few more hours before the cleaners turn up.

"Get up on the couch girls." You instruct.

The twins climb up onto the couch in your office with their knees on the seat and their elbows resting on the back so their asses are bared towards you.

"You two really are something." You say, feeling up both of their perfect asses before giving them each a slap.

The girls giggle in response.

"Whore, why don't you start fisting your sister's asshole. I don't think the men were quite as rough with her."

"Yes Daddy." She purrs, shifting over so her head is near Tracy's ass with a devilish smile.

It would seem that not only did the girls love receiving pain and punishment themselves but they also loved seeing it inflicted on each other.

"Sir?" Tracy asks turning her head to face you, questioning this command seeing as she's only had her ass fisted once before.

"Don't worry slut. I'm sure you'll love it." You reassure her, twisting her face back around to face away from you and Mia situated at her ass.

Mia starts slowly working her fingers into Tracy's well used asshole. Thanks to all the times it's been fucked today, you have no doubt that Mia will be able to get her whole fist in there. As she slides her fingers in and out of Tracy's asshole, she adds a finger whenever she feels she's ready. After starting with just one, she increases it to two, three, four and then finally all five fingers inside her sisters asshole. Once she has all five fingers in there, she adjusts to a better position so she can really **** her knuckles in. The moment she slips her whole fist in Tracy gasps and lets out a soft moan.

"Oh fuuuck." She moans out.

As Mia gets her fist in with some resistance, a little bit of leftover cum comes oozing out of Tracy's asshole. Mia's eyes light up and she swoops in to lick it up the moment she sees it.