This is very M rated.

The journey back to the TARDIS was made in silence. Their steps were quick and she did her best to keep a stride ahead of him, feeling his eyes searing the back of her neck, his hand grazing against her thigh if he got too close.

He followed her through the TARDIS door, slamming it so hard she almost jumped. She managed to conceal her shock by turning to face him head on across the room. He was staring her down, danger lurking beneath the surface, and she regretted asking for this. She knew she'd get a reaction, she knew they had chemistry, knew it would make him jealous to see her having fun with someone other than him, and the chance to push a little harder couldn't be wasted. But she hadn't expected him to get this angry.

Still he was staring, eyes doing their best to catch hers and eventually they did. Immediately she knew he'd calmed down, at least a little. His breathing was steady and he seemed in control. Watching him, she saw everything there, warring in his eyes and realized how much of this was directed at himself. If he asked her, she'd tell the truth.

"What was that?" His voice was low and she knew what that meant; by nature he was an energetic, manic person; the only time he forced himself to be calm was when that energy turned dangerous. Like now.

"Payback." She watched everything slip into place, his eyes flickering around the room and lines etching across his forehead as he thought it out. And then he looked up, shock, then outrage and something unreadable. No progress seemed to have been made because when he spoke again it was still dangerously quiet.

"Why?"

Faltering, she realized that they'd arrived all too quickly at the point where her planning went out the window because, as much as she'd thought about it, there was no reason that she knew how to articulate. "I don't know," she told him, holding his stare even when her voice wavered. "I just wanted to."

"You like seeing me like this?" he spat back and she was terrified she'd truly done this all wrong. It would have been better if they'd just stayed friends, had never broached this, played with the fire.

"Like what?" she stuttered, scared of falling completely silent because he looked like a predator, only her hesitant words keeping him at bay.

His jaw clenched and for a moment his eyes looked through her, plotting out the future, and then he was back. "Jealous," he said.

Maybe there was hope there. He was looking at her differently, she thought, his head was tilted and the anger had subsided, allowing him to calculate, to think. Still predatory, though. She responded, pushing for more. "What's there to be jealous of?"

Stopping, a hand raised to scratch over his chin as he pursed his lips. "You don't play with people like that."

In avoiding her question he'd given an answer; not a certainty, but enough. And now they'd reached a level she could argue with, so she told him, "That's exactly what you did three weeks ago. You used her to get what you wanted." It came out stronger and with more bite than she'd thought herself capable and it registered with him immediately: she was rising to the occasion, taking him on, head to head.

"That was different," he bit out.

"That's not the point."

Another pause and he moved towards her, two steps and he was still several feet away but it made her heart beat faster. "Don't play games with me." That tone was back, low and warning and somehow wildly exciting, a manic gleam in his eyes that warned everything was going to change if she didn't stop him right now.

She bit her tongue and then took one step in his direction, hesitating briefly, then asserting herself. Hands on her hips, she whispered, in her own low and dangerous tone, "You think this is a game?"

"I think you just went and snogged another man to try and make me jealous."

"And it worked," she cut in, daring to smirk a little at the discomfort that crossed his features. "Oh, did it work," she added, voice turning into a self-satisfied drawl she didn't quite feel but managed anyway.

"Of course it worked," he snapped. "And now what are you going to do?"

A small sound escaped her parted lips. There were definitely two ways in which to take this, neither of which she could bring herself to voice. "Knowing you would kiss another woman…" she paused, looking up and seeing him watching her, willing her to give in and chance it. "And it wasn't just any kiss - it was a proper kiss. It shouldn't do anything to me." She bit her lip, considering. "We should just be companions, friends. That's what we've always been."

"We kissed once," he said without thinking, needing to point out that single playful moment in which he'd taken it that little bit too far.

She ignored his interruption, intent on getting through this. "But it does...do something to me. It made me jealous, just like me kissing that guy made you jealous, and we both know why." Stopping, wondering if she'd said too much – or not enough – she refused to break the stare.

The predatory look returned. She realized too late that her silence had given him an opportunity, as he slid into action, feet gliding over the rough, metal surface of the console room floor. She met him half way before she realised she'd moved, hands sliding up his back and into his hair as his grabbed her. One at her waist, one grasping her under the chin and he paused, looking her in the eye. He was offering her a last attempt to escape, to pull back and run, but she wouldn't take it and neither would he.

Lips pressing against hers, hungry and demanding and undoubtedly bruising, his whole body hard against hers as his arms pinned her against him and his lips continued their assault. Moving more roughly, teeth nipping harder than last time, he forced her lips open beneath his, slipping his tongue into her mouth, sweeping over hers and groaning as the taste of her hit him.

But she wasn't like that and, as good as it felt, as harsh and raw and dominating as he was being, it would be better if she responded in kind. Hands in his hair, she gave a sharp tug and the noise that escaped his lips might well have been pain. It achieved what she needed it to and, her lips now free, his head angled back, she leaned into his neck. Quick, nimble hands found his tie and dragged it off, not caring that it tugged at his neck as she pulled, caring only that with it gone she could move to new skin.

Kissing and sucking, biting at the base of his throat as she worked her way down and he didn't try to stop her, just kept his grip firm around her, one hand sliding into her hair. And the combined feeling of that and the reverberations of his neck at each and every fought-for breath was making her want to do everything twice.

Biting down hard one last time prompted a growl and she grinned, moving across his collar bone with a lick that surprised him. Eyes flashing open as she nipped at his shoulder, he watched her push his shirt and jacket from his shoulders easily, wondered when she'd undone the buttons and dismissing the question as she flew across his chest.

Breath and teeth mingling until they were the same thing, her lips closed over a nipple, teeth harsher than he would have imagined, but oh so good. His hand in her hair gripped tighter, pressed her closer as she kissed lower, moving now with deliberate care, mapping him with slow, wet kisses until he got sick of the anticipation and dragged her back up to him, kissing her long and hard and deep. He pushed her backwards, not stopping until she wrenched her lips from his with a sound of surprise as she slammed into the edge of the console.

Giving her absolutely no time to react, he slid his hands down her back, gripping her thighs and hoisting her onto the console, ignoring her squeak of surprise and the discomfort that flashed across her face.

For a second she felt irreverent and silly, then his hands moved again, pressing her hips into his as he moved closer, leaving her no doubt as to the effect she was having on him. Her world was shrinking to the feel of her breasts against his chest, the feel of him pressed hard against her, and she wrapped a leg around his waist, pulling him that little bit closer, him echoing her satisfied moan.

His hands found their way between their bodies, his tongue between her lips, and he grabbed her shirt, pulling away long enough to tug it over her head. She smiled up at him during the brief separation, receiving a second's glance of searing need before he dived on her once more.

Hands sliding across her belly, impatient and irrational, his fingers moved across her stomach, traced the faint outline of her ribs, then slipped beneath the fabric of her bra. Simultaneously, their heads fell forward, foreheads touching as her eyes fluttered shut and a strangled moan escaped her lips even as a growl left his.

His fingers were working frantically under the fabric, squeezing and teasing and managing to graze over her nipple in just the right way even as his other hand began pulling ravenously at the clasp. She didn't care. She felt the material fall away in the same instant his fingers managed, finally, to scrape over the pale flesh and grasp her nipple. His lips curled in a smile of triumph against her cheek as he cupped her breasts, thumbs teasing a strangled gasp from her.

Before she could react, his teeth were grazing the skin of her neck, drifting down, and then he pulled away, leaving cold air in his place. She whimpered at that then gasped as his tongue trailed across her sternum, followed by a wet trail of hot kisses moving down between her breasts. She tried to slide her hands into his hair, but he grabbed them, pinning her arms tight against her sides; gave her a sharp, almost painful nip and she gripped the console tighter, knuckles turning white, breath coming too fast, almost in gasps as she opened her eyes. He was watching her, nose pressed against her abdomen, eyes dark and still and oh so predatory and then he stopped.

The lack of feedback on the last chapter was a bit disconcerting and I'm not sure whether it was because the last chapter was bad or because you were all waiting to read more...erm...I do love reviews...if you were wondering. One part to go, to by posted soon.