Lie to Me and its characters are creations of Samuel Baum and copyrighted by 20th Century Fox.

Unfortunately they are not mine.

A/N: - I have changed the Rating to M, Just waring y'all :P

Thanks to my lovely little Beta buddy :) Starbuck0322 you rock chicky!

Another massive thank you to all those who have R & R :) I really appreciate them xoxo {{HUGS}}

Mistake.

Gillian was mortified as she sat paralysed on the couch, watching the scene unfold in front of her. She was stunned, unable to say a word, even if she had wanted to. Ria had looked just as horrified walking in on her and Cal, finding them in the compromising position.

She watched as Ria stood mouth agape with eyes wide trying hard to avoid eye contact for a few moments before she turned and bolted out of the office ignoring Cal's calls. Gillian doesn't blame the poor girl; she probably would have taken off just as fast, if she were in her situation.

"Cal let her go," she called out after him.

Gillian's eyes followed Cal's movements as he made his way into the hall, yelling after their young employee. She could only imagine how awkward it was going to be tomorrow.

Sitting in the shadows of her office, Gillian let the reality of the situation finally sink in.

What had they just done?

She couldn't deny the obvious attraction and unique bond they shared.

But why now?

After everything Cal had put her through over the last few months, he chooses now to make his move, she ponders, completely confused by the situation.

Gillian heard the doors of the Lightman group slam shut indicating that Ria had managed to escape. The loud sound reverberated through the empty building, snapping her out of her reverie.

Sighing, she moved quickly from her position on the lounge. Stumbling a little, she suddenly felt the effects of the scotch she had consumed earlier. Making her way to collect her coat and purse from the guest chairs, she leaned across the desk in an attempt to reach her cell phone.

Gillian suddenly felt two strong hands splayed out across her lower back, and she gasped softly at the unexpected contact.

She hadn't heard Cal renter the room, and all hope of leaving unnoticed were gone.

She felt his hands slowly trace a path past her sides, coming to rest lightly on her abdomen. Slipping his nimble fingers through an opening in her blouse, she felt the cool pads of his fingers stoke her heated flesh.

Closing her eyes, she only had a moment to relish the feeling, before he took hold of her hips and pulled them roughly back into him.

Cal heard her gasp softly which only spurred him on further. Shifting his upper body, Cal laid his chest flat against her back, and rested his chin gently on her shoulder. He removed his left hand from her hip and trailed it up her slender waist, noting the involuntary shiver that it caused.

Grazing his free hand up the length of her arm, he brushed against her breast briefly and heard her suppress a moan in her throat.

"Ello' darlin'." He purred softly against her ear; his voice heavy with arousal.

Bringing his free hand up, he quickly brushed away her hair, and exposed the delicate length of her neck. Ducking his head, he nipped at the bare skin, suckled it gently, leaving a tiny, but noticeable mark which he knew when Gillian saw it, she would kill him.

"Ready to finish what we started earlier, luv?" he asked while grinding his hips into her, letting her feel just how much he wanted her.

Gillian's mind was foggy. She didn't know if it was from the alcohol or the feelings that Cal was stirring within her. She knew that it wasn't right and it wasn't the time for her to be making such a life altering decision; a decision that could quite possibly make or break their relationship.

She was still angry with him and she knew that there was a fine line between anger and passion, which they could often blur.

Yet she still couldn't help the way her body responded to him.

Gillian whimpered slightly when he latched onto her pulse point. She could feel him smile against her throat.

"Cal," she breathed. "We shouldn't be doing this," she told him, trying her best to sound convincing.

But her body betrayed her words and trembled as he ran his hand down her back, and brought them around to rest on her stomach, and played with the buttons of her blouse.

"That's not what your body is tellin' me darlin'." he growled into her ear.

"I'd say you want me, just as much as I want you. Isn't that right luv?' he questioned, bucking his hips slowly into her again. He was rewarded when he heard her moan breathlessly.

Slowly undoing the buttons of her blouse he let his fingers linger on her skin for a moment before moving to the next one. He could feel Gillian's muscles tremble as his fingers ghost over them. He reached the fabric of her bra and felt her sharp intake of breath. Grinning, he slipped his hand under the martial, cupping her breast.

"Cal," she whimpered pushing up from her bent position so they are both up right. She turned around sharply and claimed his lips. The kiss was rough and needy, and she opened her mouth to him almost immediately; all reasons as to why she shouldn't be doing this long forgotten.

Her hands promptly went to work on his belt buckle, and fumbled slightly, before she released the catch of his pants pulling down the zipper.

Cal smiled into the kiss as one hand held the back of her head; the other rested on her backside, he pushed her back against her desk. He captured her bottom lip between his teeth and bit gently, before running his tongue along it soothingly.

Cal released her head and brought his hands to the back of her thighs, lifting her slightly so she was perched on the desk. He stepped between her thighs as her skirt rode up higher.

Bringing his hands back to her face, he placed a gentle kiss to her lips before pulling back slightly, needing to look into her eyes.

"What's wrong?" she asked confused as to why he had stopped all of a sudden. She watched as he searched her face.

"Are you sure luv'?" Cal whispered softly. He might have been a bastard to her at times, but he needed to know that she wanted it as much as he did.

Gillian looked up at him with a coy smile.

To be honest, she couldn't think straight if her life depended on it, all she knew was that every fibre of her being was screaming out for him.

Cal's darkened eyes bore into her own and Gillian felt a warmth spread throughout her body.

Licking her lips, she moved her hands down his chest and felt his muscles quiver under her touch. Reaching for the waist band of his underwear, she dipped her fingers below, teasing the sensitive skin. Gillian felt Cal's right hand release her face as he dropped it to the desk beside her and lowered his head onto her shoulder.

"Darlin'" he moaned moving his mouth to her neck. "If you don't stop that now, I won't be able to control myself." He breathed; his voice low and gravelly. "I need to hear you say it, Gill," he told her grabbing her wrists halting her movements.

"I need you, Cal," she purred into his ear. "I need to feel you... Please," she whimpered softly.

Removing her hand from his pants, she gently took his hand and guided it between her thighs, inching it slowly under her skirt. She stopped as his finger brushed against her panties and inhaled sharply. At the contact, an involuntary moan escaped her lips.

"Please Cal." She gasped, as her eyes flutter closed.

The pleasure displayed on Gillian's face was all it took for his hand to slip beneath the thin fabric. He stroked her gently. Cal found her lips in a searing kiss, stealing the oxygen from her lungs.

Gillian moaned into his mouth when he slid his fingers inside her. Breaking the kiss, she dropped her head to his shoulder and clung to him tightly.

Cal couldn't believe it.

I must be dreaming, he thinks.

There was no way that his best friend, the woman he loved, was in front of him, writhing against him. As to reassure himself that she was real, he moved his fingers skilfully against her, eliciting another throaty moan from her.

"Cal" she moans breathlessly. "I need you; all of you". Making her intentions clear, she reached down between them and stroked him gently through his boxers for a moment, before pushing them down his legs in one quick motion.

Gillian bit down on his shoulder as she could feel the familiar sensation begging to coil low in her belly.

Taking Cal in her small hand, she stoked him, and wrapped her legs around him, pulling him into her.

"Cal..Please.. Now," she begged; her need for him overtaking all rational thought.

Cal smiled. He was not stupid and didn't need to be told twice.

Removing his hand from between her legs, he brought her to sit on the edge of the desk. Aligning his body with hers, he nudged at her opening, and stopped briefly, teasing her.

She let out a frustrated groan.

He wrapped an arm around her, cradling her body against his, and gazed deep into her eyes. He chuckled softly as she tried to tighten her legs around him, trying to pull him closer; however, he was able to hold her still.

Cal looked down at her, leaned in and captured her lips. He thrust his tongue into her mouth, simultaneously pushing himself inside of her.

Gillian gasped at the welcomed intrusion; as a feeling of fullness swept over her.

"Fuck, Gill" he growled feeling her warmth surround him. He quieted his movements letting her become accustomed to him.

"God, you feel so good luv," he whispered into her ear, trying to stop himself from bucking into her.

"Mmm" she moaned breathlessly. She could see he was being cautious with her, not wanting to hurt her, so she moved her hips, rotating them slowly. She used her inner muscles to clamp down on him.

"Gill, if you keep doin' that, luv', this won't last long," he growled into her ear.

She could see the strain on his features as he tried to control himself. She looked up at him; a playful smirk tugged at her lips. She contracted her inner walls and watched as his eyes darkened even more. In response, he thrust up into her.

Gillian let out a strangled moan, and Cal smirked, satisfied with himself.

"You naughty little minx," he said, lowering her back against the desk. He unhooked the remaining buttons of her blouse, exposing her black lacy bra.

"I knew you weren't a good girl," he told her. Leaning down, he kissed her chest.

Teasing her, he nipped at the fabric of her bra, and trailed a path back up her neck; while he moved his hips slowly against her.

Gillian threw her head back and groaned in frustration. Running her hands down his back , she cupped his ass, and pulled him into her roughly.

"No more teasing," she begged.

"All right, Darlin'," he said withdrawing from her completely. He gave her little time to protest as he thrust himself back into her.

Giving her no time to recover, he established a steady rhythm.

Several minutes later, Gillian's breathing became short and ragged. Feeling the familiar sensations coursing their way through her body, she squeezed her eyes shut, silently willing herself to let go.

"Cal," she cried out, letting him know she was close.

Cal could tell she was on the brink and he reached between them and brushed his fingers over the sensitive bundle of felt her tighten around him, and he watched as her brow furrowed in concentration.

He placed a gentle kiss to her lips and moved one arm around her shoulders. He held her close to his chest and kissed his way up her neck.

"Let go luv, I've got ya," he softly whispered to her.

With one last move of his fingers, she cried out his name as she tumbled over the edge.

Her body trembled against his. Feeling her grip him tightly, he thrust into her, holding her tighter against him. He felt her claw at his back, and with one final grunt, he collapsed against her.

Careful not to lean his full weight on her, he held Gillian tightly, and rested his head in the crook of her neck. Nuzzling his nose in her hair, he felt her stiffen beneath him.

"Gill, what's wrong?" he asked concerned, and pulled back to look at her. He slipped out of her warmth and frowned slightly at the loss of contact.

"Cal, what did we just do?" She sighed shakily, a tear trailing down the side of her face.

She hadn't meant for this to happen. She had let herself get lost in the feeling of him, of them; it had just felt right. But she knew it wasn't; not after the way things had been between them, after he had been jumping from woman to woman.

She pushed against his chest softly as she tried to sit up. She covered herself, slightly embarrassed by her dishevelled appearance.

Cal moved back to give her some space, and pulled up his jeans in the process.

"It's a little late to be shy isn't it, luv," he joked, trying to put her at ease, but failed miserably as he saw her shoulders tense.

"Cal this shouldn't have happened; not now, not like this," she told him, unable to meet his gaze.

"Now wait a minute, Gill. I saw your face; you wanted me as much as I wanted you. What's changed?" He questioned gently, as he took a few steps toward her.

He cocked his head to see her face. "You're ashamed," he stated; surprise evident in his tone. "What are you ashamed of luv?" he asked her gently placing a comforting hand on her shoulder.

Shaking her head a little, she stepped around him, and shrugged from his hand.

"Nothing. Forget it, Cal. I have to go." She moved to step around him, and picked up her purse.

He caught her arm before she could leave.

"Oi! Now that's a lie, isn' it Foster."

"So it's back to Foster then?" she shook her head sadly, and yanked her arm from his grip. She moved toward the door. "We can just pretend that this never happened. It's what's best for both of us. Plus, I'm sure Wallowski wouldn't be too pleased about this." She was unable to keep the disgust from her voice.

Cal was shocked. Was that jealousy he just saw?

"What the bloody 'ell are you talkin' 'bout Foster?" He asked; his tone slightly raised.

"Forget it Cal," she said walking out of her office, and down the corridor. She picked up her pace as she reached the foyer.

"Oi, Fosta' Get back 'ere. We ain't finished." He yelled after her tripping on his pants.

Gillian looked back at the loud crash and saw Cal sprawled on the floor. The picture would have been rather comical if it was under any other circumstance. She stopped for a moment to check that he was all right, and once she saw him standing, she turned and walked briskly to her car before he could catch her.

She pulled out of the parking garage and spotted Cal in her rear mirror looking out after her. His face displayed a mixture of shock, anger, and sadness.

The tears flowed freely down her cheeks as she felt the guilt begin to settle in her gut.

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