This is based on the film Straightheads, starring Gillian Anderson (so not even using that much of my own imagination here lol). It starts off quite close to the film storyline but will move into it's own in later chapters. The X files and Straightheads are not mine, I'm just borrowing them.
The sexual tension in the car was increasing with every mile. Mulder looked over at his partner and felt every last drop of blood he had left head south. Dana Scully was wearing a barely there chiffon dress that was leaving absolutely nothing to the imagination. Mulder couldn't believe it when she opened the door earlier, the rusty colours bringing out the red in her hair and complementing her tanned skin. The dress was so unlike her normal attire and yet suited her so perfectly. Her eyes gleaming with a devilish fire as she stepped out into the warm night air and into the waiting car.
They were going to a housewarming party of a friend of Skinners' that had taken a shine to them at the previous year's FBI Christmas party. As they followed the small pit fires leading a path to the 'house' they realized it was a slight understatement of the mansion in front of them. Mulder dropped his keys into the awaiting hand of the valet and followed Scully in, her predatory look doing nothing for his self control.
Looking out into the dark forest behind the house, Mulder heard soft footsteps approaching him.
'It's so quiet out here' he said, knowing whom had followed him out.
He watched as, instead of stopping next to him as expected, Scully simply smiled enticingly as she walked past him disappearing into the black envelope of the shadows. Mulder followed her, she had been acting like this all evening, their usual innuendo had taken a different weight and she seemed lustful… hungry. As he walked into a small clearing she turned and walked him back towards a big tree trunk. As he felt his back hit and his arousal surge her lips gently but insistently covered his own. The kiss quickly escalated and he felt his hands move slowly down her sides to her thighs then up under the thin material of her dress. She was panting the silence of the night punctured by her breath and occasional quiet groan. Her hands were suddenly at his zipper, pulling it down and taking his hot hard into her small cold hands. He moaned into their kiss at the sudden friction and slipped his hands under her panties to tug them down her legs.
She pushed him gently to the floor so he was sitting on the ground, back to the tree and she moved to straddle him. Their moans in unison as he slid into her warmth, such a contrast from the cool air. His hands on her hips helped set up a shaky, uncoordinated rhythm. Scully whimpered quietly, shaking from the sheer pleasure coursing through her at his movements. She had been wanting this, needing this for so long and after the steady build up this evening the release was almost too much.
His hands drew random patterns on her back as she lay against his chest. 'We have to be at work in a few hours' she said softly, not wanting to move but knowing they couldn't sleep in their current position or location.