Sup, people? I decided to really dedicate some time to this fic, and so I need to pull out all the stops here and send it into sexual overdrive!

By the way, this particular chapter was actually started a while back. I was originally going to just get rid of it, but then I decided to finish it.

On the Desk

Cortana sighed as she tapped out a few more commands on the keyboard. Her fingers were starting to get tired from the constant typing, and her vision was beginning to blur from looking at the computer screen for such a long period of time.

It was at times like this that she actually did miss being an Artificial Intelligence. In her former life, she could have completed a dozen tasks like this in the space of less than a minute. Nowadays, it took several hours to do just one of those tasks. As much as she enjoyed her new life as a human being, there were certain things that she felt were more of a burden than anything else.

It had been her creator; or rather, her mother, as Cortana tended to think of her fondly; who had put her up to this task. Doctor Catherine Halsey had continued her work for the UNSC and had needed some assistance in this area. Because Cortana possess a skill set that was nearly identical to that of the good doctor's, she had been assigned to work with her. Though the war was long since over, there was still a great deal to be done.

Originally, Cortana had jumped at the chance, thinking it would be an opportunity to make herself useful and ensure the abilities that she retained after her transition to human did not go to waste. It had seemed okay for the start, but before long, the monotony and repetitive nature had began to grate upon her. Endless typing and entering data… it was boring! And one of the things that Cortana hated more than anything else was being bored. She had gotten bored plenty of times when she was watching over John in the remains of the Forward Unto Dawn.

John. The very thought of his name was enough to distract Cortana from the task at hand, and she thought about the man she loved with all of her heart. The strong, muscular arms that held her close, the intense piercing gaze that was enough to send enemies running…

And, of course, the moments when the two of them made love.

Sighing, Cortana felt herself starting to feel a little bit better at the mere thought of John. She wondered if he would be in the mood to get a little frisky with her when she got back home. Spurred on, Cortana got back on task, determined to finish it as quickly as possible.

It took another twenty minutes, but Cortana finished entering all of the relevant data, then printed them out and placed them in their appropriate folders. She had to admit she found it interesting that humans still utilised papers and folders when virtually everything was electronic at this point in history. Dr Halsey had stated that it never hurt to have a solid copy, if only for back up. Having dealt with lost data on more than one occasion, the former AI had to agree there.

Placing the folders on the doctor's desk, as per her orders, Cortana took a moment to stretch and take a few deep breaths, easing the tension that amassed over the last couple of hours. Hearing the door open behind her, Cortana figured that the doctor had returned. Catherine Halsey had stepped out a while earlier to take care of some errands, and said that she would not be back for some time.

However, she got a surprise, but not an unpleasant one by any means, when she felt big, strong and calloused hands, place themselves on her shoulders from behind and start to knead out the tension and stress with gentle movements.

"John, you gave me a bit of a shock there!"

The man once known as the Master Chief simply laugh in his usual deep baritone; a sound that never failed to send little thrills and jolts through Cortana's being. "You know me, Cortana. I would never do anything to hurt you in any way. And that definitely includes scaring you to death. No, I reserve that for my enemies." He continued to knead her shoulders with his thumbs.

"I know the former Covenant still feels the same way about you," Cortana replied, purring with pleasure. "Of course, they don't know you like I do. They don't know what else you are capable of." She switched to a different train of thought. "So what are you doing here?"

"I don't really know exactly," John admitted as Cortana turned around to face him. "I was just at the base, doing my job, minding my own business and trying to keep myself from getting too bored, when all of a sudden, I had this overwhelming urge to visit you. Kind of strange for me to feel like that, don't you think?"

Cortana nodded. "I suppose it is," she admitted. John was the type of individual who rarely did anything just for the hell of it; he almost always had a reason. Not that she minded in this particular instance. "But I don't really care." She smiled and pressed her lips to his in a kiss.

John wrapped his arms around Cortana and pulled her close as the kiss turned more passionate. Almost immediately, the two of them could feel their bodies responding to each other, and each could feel the yearning and desire that lay beneath the surface, not only in themselves, but in their partner as well.

Pulling back, Cortana smiled at her lover. "You know," she began, "I must admit that I spent most of my time here thinking about you."

John chuckled. "Funny, I was spending most of my time thinking about you."

Cortana laughed. "Really now? Well, I was also wondering if you would be…" she paused teasingly, "in the mood when we got back home." Her hands slowly trailed down John's chest as she said this.

At the same time, John's hand also went lower down Cortana's curvaceous form, eventually coming to rest on her firm ass cheeks. "I was thinking the same thing," he murmured. "The problem is that I think we are both in the mood right now. Do you think we should duck out early?"

Cortana paused to think about this for a second. There was no denying in any way that she desired the man before her, and her mood had gotten to the point where she pretty much needed him right at that moment. They could rush home and act on those impulses, but another idea entered her mind…

"You know, why bother going all the way back to our place just to have sex?" she replied playfully. "I mean, I don't think there is any rule that says we can't to it right here and right now, is there?"

John was somewhat taken aback by his lover's remark. "Here? In Dr Halsey's office?" He looked around the room, as if to emphasise his point. "I can only imagine what she would say if she found out. Also, she is, for all intents and purposes, your mother. How do you think she would feel at the thought that her own daughter had sex in her office?"

Cortana burst out laughing at John's protests, as well as the incredulous look on his face. "Oh come on, John! What she doesn't know won't hurt her. And besides," here she started to lower herself down to a kneeling position, "there's nothing wrong with a little rebellion, is there?" With her hands, she started to undo John's pants.

Even now, the Spartan was absolutely amazed at the former AI. Not only could she knock him down with a few choice words, but it seemed that she had developed a rebellious and playful streak that was at least a kilometre wide, especially in terms of sexuality. His brain was struggling to come up with a response to what she had just said to him, but just as he started to open his mouth, Cortana had pulled out his engorged manhood and started to use her own mouth on it.

By now, all rational thought had left John's mind, and he simply leaned his head back, letting out a groan of ecstasy as Cortana gave him a blowjob. Who cared whether or not they were breaking the rules? And if they were, that didn't matter in the slightest!

Cortana let out another purr of pleasure, partly to cause sensuous vibrations in John's organ, and also to express her own personal delight at the current situation. Her lover had been raised from a young age to follow rules and regulations, so understandably having sex in the office of one of his superiors, even a civilian like Dr Halsey, would have given him pause. But she was glad to see that he was more than agreeable to such a rebellious action. After all, it simply made the situation all the more fun.

As she continued to work John's manhood with her mouth, Cortana pulled off her top and the bra she had underneath; it was one of the instances that she did wear underwear. Now topless, she kept up with the blowjob, reaching up to squeeze her own large breasts as she did so, adding to the already overwhelming stimulation.

Finally deciding that the time had come to get some receiving as well as giving, Cortana stood up. As she did so, she pulled John's shirt over his head for him. Running her electric blue gaze over his well muscled and scarred chest, she smiled salaciously. "Is it just me," she teased, "or do you seem to enjoy letting me dominate you during sex?"

John smiled back in response. "Sometimes I do," he admitted. He reached down with his hands and started to undo the fasteners on Cortana's pants. "But sometimes I like to do the dominating. And sometimes, we take it in turns." He undid her pants and pushed them down, along with her panties. "And now I think you've had your turn being the dominant one for this session, so now I'd like to have a go at being in charge." He paused for a second, and then added an afterthought. "By the way, I cannot help but notice that you were actually wearing underwear this time."

Cortana smiled as innocently as possible. "Well, I can't go commando all the time, now can I?"

John grunted and rolled his eyes. "Whatever, Cortana. Now just bend over the damn desk!" He gave her a push to turn her around; one that was both gentle and rough. It reflected both his care for her, and his eagerness to have his way with her.

The former AI felt a spike of excitement at this sudden turn of events as she felt the Spartan push her down on the desk, her breasts pushed up against the surface. Cortana had started off in the dominant position, convincing him to have sex in the office, and then proceeding to give him a blowjob that left him speechless, and then she had found herself in the more submissive role as he had her bent over the desk. It was one of the qualities that made their relationship and sex life all the more exciting. She let out a little squeal of pleasure as she felt John enter her from behind, easing himself into her womanhood.

John guided himself into Cortana until he was fully enclosed up to his hilt in her warmth. He slowly pulled back until only the head was still in, and then eased himself back in. He repeated this process, quickening his pace, and was spurred on by Cortana's increasing gasps and moans of sheer pleasure.

Speeding up his movements, John watched as her ass cheeks jiggle every time he slammed home into her. From this position, he was effectively in complete control of their lovemaking. He controlled the pace and how deep he thrust, and she simply lay across the desk while he did so. Placing his hands on her hips, he began to guide her in her own pelvic movements.

Though she was wracked with the sheer pleasure that John was inflicting upon her, Cortana managed to push herself up with her arms. With her body in this position, she started to have more control over her own movements, and began to work in sync with John. With his thrusting and his hands on her hips, she began to push back, urging him in deeper with every thrust. Cortana's breasts began to bounce back and forward with these movements, and she started to moan. She moaned even louder as she felt John move his hands from her hips and reach around to cup her breasts.

Within seconds of having her lover's hands gripping her ample mounds, Cortana felt her orgasm wash over her body, and she let out a long groan of pure ecstasy. The pleasure was so overwhelming that she felt herself getting light-headed and thought she was going to pass out. She managed to hold on to her consciousness, and was aware of John slowing his movements. Feeling his lover climax had made him slow down and let her simply enjoy the sensation.

Holding Cortana close, John waited for her to recover from her orgasmic euphoria and catch her breath. When she seemed to have calmed down he spoke to her softly. "Are you still with me, Cortana?" he asked playfully.

Cortana gave a weary laugh. "Yeah, I'm still here. Although, I don't think I've had an orgasm that intense before."

John kissed the back of her neck. "Want me to keep going?"

"Yeah," Cortana replied, leaning back over the desk. "Keep going."

With that, John continued his movements, thrusting in and out, pushing Cortana's body off and on to his manhood. Still reeling in the after-effects of her intense climax, the former AI started to moan again, albeit softer than before.

After a minute, John started to grunt louder; a sign that he himself was approaching his own climax. Deciding to do something different, Cortana pushed herself off his manhood. John raised his eyebrow in confusion, and she just gave him a knowing smile as she dropped down to her knees once again. Like before, she took his erection into her mouth and began pleasuring him; savouring the mix of his juices and her own.

John was slightly surprised at Cortana's sudden movements, not that he was complaining, of course. Usually, he just had his orgasm inside her, but it seemed as though this time, she wanted something a little bit different. Still, as she proceeded to give him another blowjob, he found it impossible to think, let alone worry, about anything else.

As Cortana's mouth moved back and forth along the length of his erection, and he felt her tongue swirling around the tip, John felt the pleasure growing inside him. Starting as a dull feeling of ecstasy, he felt it continue to build up, and his groans increased in both frequency and intensity as he was pushed closer and closer to the edge. In the end, he could hold it in no longer, and he let himself go.

Cortana noticed John shudder, heard him groan, and felt his manhood throb as he had his own orgasm. Less than a second later, she felt stream after stream of his seed squirt into her mouth. She savoured the taste of the man she loved, the pure essence of him. He continued to orgasm until she felt as though her mouth was almost full, and then stopped.

Pulling back from John's spent manhood, Cortana tilted her head back and swallowed the thick liquid. Licking her lips, she looked up at John, seeing the glazed look in his eyes as he struggled to catch his breath.

After a few moments, he finally opened his mouth. "Holy shit, Cortana. I swear that you're turning into a damn nymphomaniac!"

Cortana simply laughed loudly.

The next day, Cortana returned to the office to assist Dr Halsey in her work. She entered the room, acting as nonchalant as possible. Fortunately, the doctor did not seem to have any inkling whatsoever as to what happened on her own desk yesterday. Especially when Cortana and John had taken great care to ensure the room was as it was meant to be before leaving.

"Thank you for your help, Cortana," Dr Halsey addressed her. "I hope you didn't mind all of the work you had to do yesterday."

"Oh, it was fine," Cortana replied casually. "It was no trouble. No trouble at all…"

If only the good doctor knew, I doubt she'd want to use that desk ever again!

And it looks like Cortana has started to branch out in what she does. Nothing wrong with that, is there? (Wink, wink)

To Dragoon Galaxy: I'm thinking I'll use your suggestion for next chapter. Just be patient, my friend.

To Major Mike Powell III: Sir, yes, sir! Oo-rah! (Always wanted to do that!)