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Having sampled from both her mouth and her pussy, you decide that if you get your choice, and it appears you do, you want to sample the final orifice in the trinity.

You reach down and slide a finger underneath her body and into her pussy, coating it in her juices. Scully makes a small noise that you interpret as pleasure. You pull out your finger, and begin to play it around her ass, massaging the whole until it grants you entry. You finger it a little longer, to loosen it up slightly. As you do, you state clearly, "beg for this, you little red-headed whore." Scully immediately begins urging you to fill her up again, begging you to "open her like a book."

You grin, and grap on to her hips. You pull her back and up, so that she is kneeling, her face still flat on the bed, but her ass now up in the air. The move jostles her panties back to their normal position, covering her up, so you shove them halfway down her thighs, leaving her ass once again bare. You kneel behind her, knees at a 90 degree angle, and position your cock against her asshole. You grabs her hips, and get a tight handful of flesh in each, then pull her back against you.

There is a moment of resistance, then your cock pops in to her anus, and glides smoothly in. You ease off, pushing her away slightly, giving her ass time to accomodate, if only slightly, then push again, further in. You back off again, then push in one final time -- not actually moving your hips at all, but rather pulling back on hers, making her come to you. Her asshole squeezes against you like a glove two sizes too small, but you **** her hips back until your cock is once again buried to the hilt inside her. Scully lets out a small cry, but it is quickly cut off -- you assume by her biting her lip to keep quiet.

Leaving one hand wrapped around her hipbone to hold her in place, you let go of her other hip, and give her asscheek a quick but firm slap. You then grab the asscheek, getting a handful of its firm flesh, and begin to fuck her in earnest. Holding her hip stationary, you slide your cock out until the tip is just at the entrance of her asshole, then shove it back in. Her ass again constricts around you, trying unsuccessfully to prevent reentry. You hear a slight gasp escape from Scully's mouth, but nothing more. You pull back, and again plunge into her, this time accentuating your reentry with another slap on the asscheek. A rhythm established, you repeat this pair of actions until you feel the cum, so long imprisoned inside of you, welling up.

Still holding her hip, you pull out of her ass entirely, and with your free hand jerk the cum onto her waiting ass and back. Some of it shoots far enough to get onto the back of the small shirt she is still wearing, but most adorns her lower back, and drips slowly down the crack of her ass.

You let go of her hip, expecting her to collapse to the bed, but she remains in exactly the same position -- face planted in the bedsheets, on her knees, ass high and bare in the air.