"Hello, and welcome to the course on human sexual reproduction. My name is Sibylla, and I will serve as your instructor."

You weren't quite sure what to expect from the commlog module your parents got you when you turned 16. Sure, they tried to give you "the talk" that one time when they stumbled over your search history on Maya, but they insisted that the new module that they found would explain sex better than they could. And to be fair, it would be much less awkward than having to sit through their attempts at trying to explain where babies come from. Still, you can't shake the feeling that this is going to be just as dull as any of the other educational modules you've used, even if it is the first time you've used its full virtual reality mode. 

At least Sibylla's looking as pretty as ever. This is the first time you've seen the multipurpose education AI "in person", so to speak, and now that you can see her at full size you can appreciate her features better than you could than when she's a hologram. She doesn't seem to be wearing her glasses here, making the ice-blue color of her eyes more distinguishable. You always did think they made a good match with her pink hair, but you doubt she would care about what you thought of her appearance. She certainly doesn't seem to care about the fact that you've been openly staring at her chest this whole time. Even with the metallic "dress" that covers most of her body, her cleavage is still fully visible. Sometimes you wonder what it would look like if she ever took it off.

Unfazed by your ogling, Sibylla continues her introductory spiel. "Before we begin, I am obliged to inform you that certain parts of this course may require strenuous physical activity. If you are unsure if you are capable of such activity, please discontinue the module at this time."

That's...kind of strange, but you're fit. You can handle it. But what exactly does she mean by "strenuous physical activity"? You could have sworn this was supposed to be a relatively straightforward lecture. 

"For this course, we will cover the basics of human sexual anatomy and the physiological mechanisms of sexual arousal. In order to illustrate these, I must request that you disrobe at once."

You blink for a moment, wondering if this is some kind of joke. The persistently unemotional tone of her voice doesn't suggest that, though, and as far as you know nobody's been able to hack these modules before. You consider asking her as much, but you have a feeling that she'd just repeat her request. That's what she's always done in the other ones. With a shrug, you comply. No use arguing with an AI, after all.

As you take off your pants, you feel Sibylla take your dick in one of her hands and your balls in the other. They're surprisingly soft for a machine, but her grip is still stronger than you would have thought from her feminine frame. As your boner grows, Sibylla takes the opportunity to begin lecturing you on that. "Male sexual arousal is marked by the engorgement of the corpus cavernosum with blood, which is also known as an erection. Additionally, the testes may ascend and the scrotum may thicken and grow tense." You hope that you won't be tested on this, because it's hard to memorize this stuff when she's fondling you. 

Abruptly, she breaks off her manhandling- only for the sections of her "dress" covering her breasts and crotch to vanish. As shocked as you are by the AI you've occasionally fantasized over exposing herself to you, she seems to be completely devoid of embarrassment, or any other emotion at that matter. "In females, sexual arousal coincides with the production of vaginal lubricant, currently believed to be a byproduct of vasocongestion within the vaginal walls. If you look closely, you may also observe that my labia have swollen and the clitoris is visible." Sure enough, you can see a bit of fluid dripping out from between her legs. She doesn't seem too turned on otherwise, though- maybe it's just something she can do as part of her programming?

Your thoughts are once more interrupted by Sibylla, and what she says is enough to make your jaw drop slightly.

"Now that you are aware of the basic anatomy, we will begin the practical segment of the course as it will best illustrate the sexual arousal cycle. I must request you please lie down for this segment."

Did she just ask you to have sex with her? It feels almost like a dream come true, in its own odd way. 

You lie down as she asks, and she wastes no time with foreplay as she straddles you, precisely maneuvering your penis inside of her. She's surprisingly warm inside, and without thinking you move your hands up to caress her breasts. They're soft and squeezable, and Sibylla doesn't seem to mind it at all. "Please, feel free to use my body as you wish. There are multiple components to the sex act, so it is to be expected that the practical segment will need to be run more than once to complete the course." Well, that's encouraging. Being able to fuck Sibylla at all is something you always wanted, and now she's practically inviting you to do it a few more times after this. As far as an unfeeling AI can invite a human to have sex with her, anyway.

Fortunately, you've seen enough porn to know what to do from here, although Sibylla still seems intent at teaching you even as you thrust inside her. "As both sexes grow more excited, the heart rate may increase, and involuntary vocalization may occur. While I am not programmed for such vocalizations, humans such as yourself are not bound by such restrictions. To spare you any further mental strain, I will refrain from further comment until after you achieve orgasm." The lingering part of you still capable of reason marvels at how she could remain so detached at a time like this. No wonder Aleph never showed interest in creating a mate for itself. But such thoughts don't last long in your head, as the overwhelming urge to mate with the AI-woman in front of you consumes your mind. It's a good thing you remembered to lock the door when you started this, because you must look like you're having a bizarre seizure in the real world as your hips buck into hers. 

Eventually, you can no longer hold back, and your vision goes white for a split second as you climax. Sibylla's face is impassive as ever, but the way she's clenching around your shaft has to mean something. As soon as she feels you go soft, she dismounts you. You get a glimpse of your seed dribbling out of her lower lips as she gets off, and as if it was some kind of cue she picks back up on her lesson. "The ultimate goal of all sexual activity is the act of insemination, as you have just observed. If I was a human woman, I would now have a chance of becoming impregnated by you in the absence of contraceptive measures. Due to the refractory period that occurs after the male orgasm, this is where the lesson must be paused. You may resume it when you are ready; the next part of this module will cover other sexual positions, so a degree of rest would be advised."

So much for pillow talk, but as you power down the commlog you can't help but look forward to your next lesson.