AN: So here's the 4th part, just one more after this... I know sad right... Anyway keep reading, keep the reviews coming and i'll try to get the last chapter up sometime today if not it will definitely be tomorrow. Oh and definite adult warnings for this chapter... even more so than the last one so if you shouldn't be reading that then skip ahead.

Bottom Line Part 4

He called her at five fifteen because he was sure he couldn't wait a moment longer and she didn't make him. She'd already shut down her computer and packed up. In fact when he called her she was already heading out of the lab and into the grounds so he wouldn't even have to park. She wasn't sure she'd make it home, but she told herself she had to, but the slick wetness that had taken residence between her legs ever since lunch was making it difficult to think rationally. She knew it was a combination of her lunchtime shopping trip, the kiss she shared with Booth in her office, the anticipation of the night and the knowledge that she had a secret, that she wasn't wearing any underwear.

She was in his car at five seventeen and his lips were on hers at five seventeen and maybe two seconds. He felt like a horny teenager, the only difference was, for once the girl wasn't putting up a fight, and the girl wasn't a girl, rather a particularly stunning and successful woman. With no hesitation his hand slipped beneath her skirt and cupped her, wondering if it was the thought of him that had brought such warmth to her, his fingers slipped easily inside her and she groaned, throwing her head back against the rest. Slowly he began to pump his finger in and out of her, quickly adding a second and third finger and using his thumb to massage her clit. His other hand rested on her knee keeping her legs spread as wide as he could in the tiny space. She slid forward on the seat, her eyes closed, and he wished they were open so he could see the dark blue that he'd noticed always appeared when she was aroused. And then her hand was on his guiding his free hand up her thigh and sliding his index finger into her ass. This time they moaned in unison and Booth was sure she was just trying to torture him.

She could tell he wasn't sure what to do and kept her hand there guiding his in and out of her anus until he seemed to realised what she wanted and rammed a second finger inside until he was pumping both of her holes with his fingers until she came hard, shuddering around his fingers and screaming his name.

He didn't even wait for her to recover before pulling his fingers out of her wiping them quickly on his pants and shoving the car into drive, the faster they got back to her place the better. She smiled coyly at him as he pulled away from the curb, leaving her skirt in a twisted mess around her thighs she popped open an extra button on her shirt allowing him a perfect view down to the red lacy bra that hid her ample breasts from view.

He groaned "Damn Bones, you're gonna be the death of me"

Brennan had already tried everything sexually that she'd ever wanted to, so she focussed on the things she thought Booth would like to try, though she knew everything would be different with Booth. Every touch seemed to be heightened, every touch sent tingles through her body and she longed to feel it all the time.

"So Booth, are you going to tell me now exactly what your fantasies are or do I have to guess?"

"Huh?" Booth asked confused his mind still on what had just happened in the parking lot of the Jeffersonian while who knew how many people had walked past.

"Your fantasies... What are they?" she rephrased, her hand sliding a little further up her thigh and exposing a little more flesh.

"You" he answered easily, forcing himself to look back at the road rather than the beauty beside him, her cheeks still flushed from her recent orgasm and her lips red from the passionate kiss they shared.

She laughed "Well that's pretty easy to fulfil, but I was talking a little more specific"

"Well honestly Bones, so long as you're involved everything sounds good" she gave him a look and he knew they'd never get anywhere if he didn't give her something "Some of that stuff you mentioned yesterday sounded good" he admitted.

"Anal sex?" Booth nodded not trusting himself to speak. She sensed his hesitation though "You know Booth, anal sex is actually more common amongst heterosexual couples than gay couples" he wasn't sure how she knew what he'd been thinking but he didn't dwell on it.

"Really?"

"Yes, in some couples it's even the woman who penetrates the male using a strap on. Actually Booth, I bought you your very own butt plug while I was shopping today" Booth groaned, he'd almost forgotten about the two bags she'd chucked into the backseat before climbing in.

"All that stuff you listed before... you were serious?"

"Why wouldn't I be?"

"Oh god" he groaned.

"I thought you'd enjoy it, in the past I've had many sexual partners who enjoyed it when we used other objects to enhance our pleasure and it's much safer to use objects that are designed specifically with sexual pleasure in mind, it results in far fewer injuries." Brennan continued talking detailing the types of injuries that could be incurred from using objects that could break off inside, such as cucumbers, glass bottles and other things he would never had thought of shoving inside anywhere, not even his mouth.

"It's okay Booth, I know how to use all of these things, you won't be in any danger, I promise" he knew she was telling the truth, she wouldn't hurt him anymore than he would hurt her. He smiled, maybe it would be kind of fun to experiment with Brennan, just not with the butt plug he thought wryly pulling into her apartment building.

He had no idea how he managed to keep his hands off of her when they entered her apartment but he did, long enough for her to offer him a drink and for her to start pulling objects out of the two mysterious black bags. He wasn't sure how she managed to sit next to him and calmly cut open the packages revealing the treasures hidden inside. But she did, until they were surrounded by two empty bags and a couple of piles of her purchases and a much higher pile of packaging.

"Are you sure we're going to need all this?" he asked nervously.

"Booth, its okay... we're going to go at your pace, but yes eventually we will be using all of this, but definitely not tonight" it seemed strange that it was her reassuring him not the other way around, but Booth's mind did not focus on that. All he heard was, eventually, that meant more than anything to him, because no matter what she'd said the day before he was still waiting for her to freak out and tell him she'd been tired or something. He was waiting for her to deny what they both felt, no matter how much he hoped she wouldn't. But she was sitting next to him talking easily about a future with him and he realised that she was ready, to give everything to a relationship with him.

She seemed to sense him still looking at her "Would you like to go to the bedroom?" she asked confused about why he was staring at her.

"Sure Bones, sure" he replied grinning, his mind not on the pile of toys she was lifting into her arms but on his future with her.

"Booth, could you grab those?" she asked gesturing towards a few items still left on the table, she didn't bother to dispose of the packaging, there would be time for that later, her mind was focussed solely on exploring her newfound sexual relationship with Booth. He trailed only slightly behind her into the bedroom letting his eyes wander over her body, enjoying the way her skirt swayed in time with her hips. She'd already pulled off her boots and socks allowing Booth to see her toned calves and the way her toes curled into the carpet as she walked. She was already sorting through the pile having dropped them onto the edge of her bed, one pile she left on the bed the other she picked up again and dropped onto the dresser.

He was relieved to see that the pile on the bed was much smaller than the one she deposited on the dresser. He continued to watch as she bent over her side table and pulled out a couple of objects dropping them next to the rest. He didn't examine the items too closely looking up to see Brennan smiling at him from next to the bed, and then he was with her in a few quick steps. Their breaths mingled together, his lips so close to hers that he could almost taste her already. It was Brennan who eventually closed the distance between them, her lips crashing against his and her body pressed flush to his. It took all his self control not to rip her clothes off then and there but he managed it, settling for sliding a hand beneath her shirt to rest on her stomach. She moaned as his cool fingers contacted her warm skin and pressed further into his touch. He didn't even notice her slipping the buttons of his shirt undone and pushing it down his arms. The only time their lips disconnected was while he quickly slipped her shirt over her head, not bothering to check where it landed before his hands began working on the clasp of her bra.

He'd forgotten she wasn't wearing any underwear until he slipped her skirt down her legs and it pooled at her feet leaving her standing before him completely naked. His thoughts barely strayed to her panties still in his jacket pocket, focussed instead on the beauty before him. She climbed onto the bed waiting patiently for him to shed the remainder of his own clothes, he could see her hands itching to touch herself and he almost wished she did. Her legs were spread waiting for him, and he couldn't make her wait. He was with her on the bed, his hands on her stomach and breasts, sometimes hard, sometimes soft. He slid one hand down between her legs, caressing her thigh for a few moments before pressing his finger against her clit finding her still wet and ready for him. His lips latched onto her breast while he slid his finger up and down the full length of her sex. With every movement she bucked her hips upwards, yearning for his finger to once again stray into her tight anus. He knew what she wanted, but instead slipped his finger into her vagina, using the other hand to flip her over and allowed himself to examine the pile of aids still left on the bed just next to her breast.

Lube, good, he decided; if he was going to give her what she so obviously wanted he knew they would need plenty of lube, at least that was what he'd heard in the locker room. In addition there was a dildo, and what he assumed was a butt plug that he'd seen her pull out the drawer earlier. Along with what he remembered her referring to as anal beads and a cock ring. He left everything except the lube in its place.

Brennan was already on her knees when he turned back, her ass waving in front of him, even better than he'd imagined just a day earlier. He couldn't stop the hand that reached out to touch the creamy skin, kneading her cheek in his hand. Her moan urged him on and he realised that he wanted it as much as she did. The thought of plunging his hard cock into her tight ass was almost overwhelming. With no warning he slipped his finger inside not bothering with the lubricant, he felt her tense slightly and heard himself moan at the tightness of her around his finger. As he pumped the finger in and out she spread her legs just a little wider, he pressed a second finger inside stretching her.

"Booth" she groaned breathily, her head twisting around so that their eyes met over her shoulder. His free hand went to her breast.

"Tell me what you need Temperance" She moaned again as his fingers worked her nipple into a rock hard nub, she didn't even try to speak instead put her weight onto one hand and gestured next to her to the string of anal beads. They were crystal and blue in colour, six in total and they seemed to rival his own cock in diameter. He looked from the tiny hold that he'd barely been able to squeeze two fingers inside to the large balls and wondered how on earth they would ever fit inside.

"Bones, they don't look like they'll fit" he worried.

"Lube" she breathed gesturing frantically to where she thought the lube was. Booth nodded, they'd need a lot of lube. He pulled the cap off and squeezed a generous amount into his palm before dropping the tube and rubbing his hands together smothering them in the liquid. She moaned happily when his hands returned to her ass rubbing over the entrance until it was wet before slipping a couple of fingers inside her and lubricating her insides. Once he'd smothered the blue crystal bulbs he proceeded to press the first one inside using his free hand to stretch her. He watched as the first ball was swallowed easily by her ass hearing her moan happily as it disappeared completely.

It had been a long time since she'd had anal sex with anyone, it was something that she'd always enjoyed but not something she'd trusted most men to do. She thought she might have been able to trust Sully but the sheer size of him had put her off a little and he'd never made any mention of it so neither had she. There'd been a time when she trusted Michael Stires with that aspect of herself but that had been a long time ago and it certainly wasn't the case anymore. He had been the last and it had been almost six years since then, by her choice not his, she had decided when he'd last visited to not allow him that particular pleasure and she was glad she hadn't.

However Booth slipping bead after bead into her ass didn't bother her, she was completely comfortable with the idea of it. Of course she had to admit that after so much time the strange sensation of having her ass filled was somewhat foreign but certainly not unenjoyable. Booth was surprised when he was able to push all of the balls inside her and watched as her ass wriggled in front of him moving the beads around inside her.

"Booth" she begged again. This time he didn't hesitate, slipping his rock hard cock inside her in one swift motion. He could feel the beads pushing against him from inside her. With every thrust they moved around slightly and with every thrust she let out a strangled cry pushing back to meet him. Her fingers curled into the sheets and he could feel that she was getting close, a strangled cry and a frantic gesture towards the string hanging from her ass confirmed it. As always he sensed what she wanted and began to slowly pull the string of beads from her ass making sure he timed each pop with a particularly strong thrust. As the last bead popped from her ass he felt her walls contract around him accompanied by the cry of his name, it was all he needed to send him over the edge spilling himself inside her.

He forced himself to pull out of her and roll to the side as she collapsed onto the bed crawling until her chest was pressed against his, her arm thrown lazily across his chest.

"Don't get too comfortable" she teased "I'm not finished with you" Booth smiled lazily down to her, where her head nestled on his chest. Rationally he knew they needed to get food and sleep otherwise they would be too exhausted the next day to even get any work done. But he decided that if Brennan could put her rational mind aside then he could too, because some things were just a little more important than logic and rationality.