Author's note: This is a bit longer than previous chapters. It turns out that I got frustrated with the cliffhanger endings, too. I figure one or two more chapters should… er… bring things to a climax. Or two.

As Booth's index finger joined his middle finger inside her, Dr. Brennan had two sudden revelations. The first was that she was fully aroused, and not interested in any more manual stimulation; the second was that she had been a very poor participant in this whole "procedure." She had passively accepted Booth's attentions, and not reciprocated in the least.

"It occurs to me that I've been neglecting you," she purred. "I believe that it would only be… proper if I were to return some of the exceptional attentions you've been paying me."

"That's very considerate, but not really necessary, Dr. Brennan."

"I think I'll have to insist," she said, and slid her hand down his torso – and received a very pleasant surprise. "Booth, you are already fully aroused!"

"I'm… quite aware of that, Dr. Brennan." He said through gritted teeth.

"No, I'm quite serious. Your penis is fully erect – I don't think I've ever encountered it in quite as aroused a state. I would estimate it at about 19 centimeters in length, seven centimeters in circumference, and about 20 degrees above perpendicular. Plus…"

Booth was snapped out of his reverie. "How the hell did you come up with those numbers?"

"Old field work trick. I use my own body parts as established metrics. I know the precise lengths of my forearm to wrist, wrist to tip of middle finger, handspan, foot length, armspan, and various other dimensions, and can use them to extrapolate almost any measurement with an acceptable level of accuracy."

"That's… very impressive, Dr. Brennan."

"Thank you. As is this." She tightened her grip on his penis, and slid her thumb over the head. "The amount of Cowper's Fluid you are producing is quite remarkable, considering how little direct stimulation you've received."

"Cowper's what?"

"Pre-ejaculate. It serves a variety of purposes, but mainly serves to…"

"Feel really, really good." He removed her hand. "But seriously, I don't need any additional 'stimulation.' Unless you'd like to forgo the next step…"

"Intercourse? Absolutely not."

"Then, shall we proceed?"

"Most definitely." With that, she lay back and parted her legs. Booth moved over her, supporting his weight on his knees and one hand, while the other guided his penis towards her entrance.

"Ah, more teasing."

"You do seem to enjoy it."

"Most of the time, yes. I do find it quite enjoyable when you brush the head of your penis against my labia, sweeping up and down, then slowly pressing into the entrance of my vagina, denying me the full pleasure of penetration."

"Not until I'm ready, Dr. Brennan… and I'm convinced that you're ready, either."

"…and if I should disagree?"

"You'll just have to wait."

"I think not. I believe there are avenues open for me to set the pace of our intercourse to that of my own choosing."

"Oh, really? Such as…?"

She pulled his head down, pressing her lips to his ear. One hand slowly tickled the back of his neck. She whispered throatily in his ear. "I could beg you, I could plead you, I could entice you, I could make some erotic promises if you acted as I wished, or…"

"Or what?"

"Or I could simply take control of this situation." With that, she hooked her legs around his thighs and clenched her muscles, simultaneously pulling him down and thrusting up with her hips.

Booth's eyes nearly crossed as he suddenly and unexpectedly found himself completely buried within Dr. Brennan. "Whoa… my God…"

"You see, Agent Booth? I informed you that I had had more than enough of your stimulation and teasing, and that I intended to get what I wanted despite your delays. And now your penis is fully ensheathed within my vagina, to the point where I can feel your testes against my labia and perineum – the derivation of the vulgarism 'balls-deep,' I believe."

Booth didn't trust himself to move or even speak. "Uh-huh."

"And now, I wish to engage in intercourse with you, with the goal of orgasm. I would prefer to do so with your cooperation, as that greatly enhances the satisfaction for both of us, but as I have demonstrated, I am more than capable of simply taking what I wish. For example, if you refuse to begin thrusting, I can move my own hips back and forth to achieve my own stimulation – see?"

Booth whimpered as he felt another jolt in his groin. He pressed down as hard as he could with his hips, trying desperately to keep her from moving. "If you keep that up, this will end a hell of a lot faster than either of us want."

"Oh, you would rather I not move my hips? I can accept that." She stopped her thrusting, then closed her eyes to focus. "As I have demonstrated before, Agent Booth, I have spent considerable time developing my conscious control of my pubococcygeus and other pelvic muscles. Which means that I do not need to move my hips to stimulate your penis – I can contract and relax the muscles surrounding my vagina with absolutely no external indications – like thus."

Booth let out a high-pitched whine that could only be described as a keening. "Dr. Brennan, I understand you might wish to repay me for the teasing and stimulating I've been inflicting on you. But if you don't give me at least a minute or so to get control, you will end this encounter within seconds. And if you do, I promise you I will not help you achieve orgasm."

"I have already had several small orgasms, so that is not that great a threat. Further, I am fully capable of stimulating myself to orgasm, should you experience premature ejaculation. However, you are correct in your presumption that I would prefer a prolonged period of intercourse, and I will respect your request for a pause in physical stimulation so you may reassert your control over your arousal."

"Thank you, Dr. Brennan."

She allowed her arousal to lower her voice to a deep, breathy whisper and purred in his ear. "Yes, I will refrain from any sort of motion that could further stimulate you until you inform me otherwise. I shall be content to simply lie here, my arms around your torso, my fingers on your back, my breasts against your chest, my erect nipples brushing against yours, my legs around your waist, and my vagina embracing your penis…"

Booth had had enough. As good as he was at teasing her, she proved that she could shred his willpower and restraint with ease, any time he wished. He shut her up the only way he knew guaranteed to work. He kissed her, deeply, his tongue probing the depths of her mouth.

(Typo fixed)