His alarm is going off.

MES project subject rooms were provided with a high-quality computer system for recreational (and some non-recreational) use, and the room controls were able to be tailored through it. Jace had set up the installed time-management software to turn the lights up slowly, simulating sunrise despite the underground facility, then trigger an alarm 15 minutes before the daily checkup/measuring session. This allowed him a brief period to relax in bed before his day started.

To the loud beeping of his alarm, Jace groaned awake, wondering what was stuck to his cheek. Pulling it off, he saw it was a protein bar wrapper. As he regained his bearings and recent memory returned once more, he realized he was lying on the floor of his room. His muscles ached, probably due to the unaccustomed physical exercise of yesterday.

With a grunt of not-quite-pain, Jace stood upright and shambled toward his bed, slapping his hand on the flashing alarm to turn it off, and tossing the wrappers into the disposal chute next to it. A glance at the time display showed him he'd slept through most of the 15 minutes his alarm gave him, so he quickly removed his clothes (project participants were required to sleep naked, in case an unexpected growth might damage them in restricting clothes), tossed them next to the chute, and climbed into his bed under the sheet.

The secret project MES called "Male Enhancement and Sexualization" was named that intentionally to allow usage of the same acronym as that of their public name, so anyone who somehow gained illicit access to some data would be less likely to suspect anything. The actual name of the project and any truly incriminating similar information was only present on the intranet, which was physically separated from any outside internet connections. Porn and other information the internet offered was accessible to everyone, but their computers were tightly controlled by those administrating the network, and no software could be installed without asking a human for permission. There were additional safeguards in place, but Jace didn't fully understand them. He'd briefly worked as low-level tech support before nantech, but after that he'd been caught up in a whirlwind cycle of fucking the newly stunning and horny women around him, recovering for a day, and doing it again.

MES project participants were provided climate-controlled rooms which they could adjust to the perfect temperature and humidity for their optimal comfort. This allowed the majority of them to sleep completely naked and with minimal sheets/blankets. Jace often woke up having rolled out of the sheet in the night.

Jace's usual pre-sleep routine involved checking which staff member would check in the next morning, but his unexpectedly long sleep due to...why HAD that happened? Even the few times he'd tried exercising before, he hadn't had THAT reaction...Nevermind. Whatever the reason, he'd gotten around 12 hours of sleep. He pondered the odd events of yesterday until 3 minutes later, when Lily arrived once more.

Jace was happy Lily was still assigned to his section, but he knew the rotation ensured that would only happen for 2 weeks once every few months. MES didn't want their project staff to get too close to the subjects/participants. It might skew results and thus impact their end goals.

Lily shook his shoulder gently, and out of the corner of his mostly closed eye, he saw the stupendous jiggling wave that motion caused in her massive boobs.

His dick started quickly filling with blood, but as he was lying on his side, it wasn't that noticeable. He groaned lightly and stretched, careful to not dislodge or tent the blanked covering his groin.

"Lily?"

"Get up 24793, it's that time again.", Lily said in a bouncy and cheerful tone.

"You're in a good mood", he said, climbing out of bed on the opposite side and facing away from her, stretching his arms upward. He glanced over his shoulder and saw her blushing slightly as she was caught staring at his ass. "What?"

"Umm...24793? Have you been working out? I could swear you've gained muscle or something, and you're not as...flabby as I thought you were yesterday. I must have missed it somehow."

Jace hedged a bit. "Yeah, I started walking more a couple weeks ago, and after yesterday, I figure Chad'll be after me because I passed him on the charts. And you know some of the security are friendly with him, so I'm not safe unless I'm in my room or around staff who won't let him get away with his bullshit. According to the rumors, he's been sabotaging anyone who even threatens his spot on the volume charts, and I just passed him. I bet he'll be out for ****, I doubt I was even on his radar, so...I went to see Mari and she had me start running." Jace bent down and started doing so leg stretches, groaning slightly. He also turned his head just enough that he could see a flushed-faced Lily staring at his ass again...and that her labcoat nipple tents were back to visit.
Pretending he hadn't noticed, Jace willed his cock to soften further (it mostly worked) and then walked around the bed to stand next to her, "accidentally" just barely brushing his arm against one incredibly prominent nipple as he did. "Sorry Lily", he apologized, pretending he hadn't heard her soft moan.

Lily shook her head slightly, as if to clear her thoughts, and pulled out the measuring equipment.

Lily was still significantly aroused for some reason, and she had to **** herself not to fondle his genitalia as she measured it. His cock was looking quite good today, she mused, hanging heavily from his groin at what must be 6 inches soft.
She hummed happily to herself as she measured. Yep, 5.96 inches long, and a nice 2 inches wide. The thicker the better, in her opinion, and she briefly wondered how big it'd get when fully erect, as she entered the info into the tablet.

Her tablet screen flashed warningly, and she checked it before glaring at #24793. "24793, I'm showing you as almost as big soft as you were hard yesterday, have you been sneaking in some porn before I arrive? You know we need good data on flaccid state! I'm going to put a note in your file, if it happens again your porn access will be limited to after measuring only. I'll have to stay after you're done and measure again." She huffed in exasperation and started entering something on the tablet.

As Lily tapped away on her tablet, Jace peered down at his cock, confused. He'd thought he had it under more control, he must be at least halfway erect to get that result, but even then he must have grown a bit? Was the code working even better than he thought?

Lily glanced up and frowningly pointed at the collection system.

Jace pretended to hang his head slightly and went to it, donning the headset once more.

Trying to distract himself from thoughts of Lily's erect nipples, and especially what they might look like if she wasn't wearing her lab coat, Jace decided to try a randomly generated scenario based on his preferences this time. Occasionally the software came up with something good.

As the menu faded away, he found himself in his own bedroom, with no one in front of him.
Glancing around, he saw Lily where she'd been when he headed for the VR system, but now facing away from him, doing something on her tablet. For a second he thought the VR must be faulty, but then he noticed her tablet on the bed, and that she was gently massaging a nipple through her lab coat. Reassured that this was definitely a VR version of Lily, he paused a moment to admire the way her tremendous ass jutted out behind her, firm and perfect. He walked up behind her and wrapped his arms around her waist, nestling the massive bulk of his huge half-hard cock between the glorious globes of her ass.

She let out a small "eep!" of surprise, then pushed her ass back against his cock, moaning throatily. "Let me", he said, and gently pushed her hand away as he stretched forward to grasp both of her huge nipples through her clothing. After 30 seconds of manipulation, he had her mewling with pleasure, but he wanted more, so he ripped open her labcoat with a growl of irritation. Her braless breasts bounced gently as they were freed. After nanotech, no woman needed a bra anymore, although there were plenty who still wore them for various reasons - but mainly for fashion or as a sexual aid. Jace's hands went instantly to the huge nipples, jutting at least 2 inches from her breasts, and at least an inch across. He proceeded to lavish attention on them for the next 5 minutes, bringing the VR Lily to at least two orgasms from that alone, judging by the floods of wetness that drenched the base of his cock.

Speaking of which, his cock was now fully hard, and while he couldn't see it over her shoulder past the massive mounds of her tits, it must be jutting about a foot past her vagina, despite how far back her massive ass kept him. In VR, his cock was always at least 2 feet long, that was a minimum requirement he'd entered with the initial limit settings.

Pulling back, he ground the bulging veins of his massive tool against her vagina lips as he did so, bringing her to another orgasm before shoving her gently towards the bed. She spun around as he did so, a shocked look appearing on her face as she fell backwards onto the bed, which creaked alarmingly as she landed. Few women weighed less than 160 pounds after nanotech, but it was all in the right places, and Lily wasn't on the lighter side of the new average. Stalking forward, his massive cock bobbed gently in front of him, massive nuts bouncing against his legs. He heard Lily mumble "it's bigger than Long Dong!", and she was staring at him with an awed look on her face as he bent his knees slightly, lining his cock up with her pussy. "Oh YES, do it!", the VR Lily groaned, "Fill me up!"

Slowly, Jace pushed the massive head of his cock against her pussy. The thing was at least as big across as a softball, flaring wide before tapering in slightly to the rest of his cock. Lily's vagina was spreading tightly around his cock, massaging the head as he pushed further in. She was screaming almost constantly in pleasure, only stopping to take tremendous gasps of air so she could continue. The effort tossed her tits around wildly, arousing him further.

Lily groaned as the visible bulge of his cock distended her abdomen, slowly moving upward until he hit an internal barrier. She must have orgasmed another 5 times by then, and was nearly delirious with pleasure, but she still managed a **** cry of "MORE!" as he stopped pushing.

Jace's cockhead pushed against the barrier, and he grunted as Lily's pussy clamped down on him once more, another flood of pussy juice running down the foot of cock that remained outside her to further inundate his already soaked testicles. Applying more pressure, he felt the barrier that had to be her cervix give way, his cockhead entered her womb, and a piecing scream from Lily made him stop for a second in concern. But it was just a somehow higher plane of orgasm, and he watched her twitch and shake on his rod, eyes rolled halfway up into her head, the scream dropping in pitch until it became a throaty growl.

Lily's eyes suddenly popped open and a lust-filled glare froze him in place. "Did I tell you to STOP?!?", she growled. Her legs, fit and strong despite a heft that the pre-nanotech world would have considered almost fat, sprang suddenly into motion, snaking around his waist and jerking him further into her womb with startling ****.
A growling scream of pleasure came from her as his groin met hers, and she rubbed her hands over the obscene bulge in her stomach, staring at it with another awed gaze. "Fuck yessss!" she growled, before her eyes snapped up to meet his again.

"FUCK ME!", she ordered.

So he did.

Half an hour later, Jace gazed down upon a woman essentially comatose from pleasure, emitting a constant low groan interrupted only by his cock compressing her lungs a bit when he bottomed out. A small bulge of his precum had built up over time in her womb, unable to escape the seal her still tight and constantly orgasming vagina made around his incredibly thick cock. Jace was nearing his limit, although if he hadn't been immersed in the VR experience, he'd be wondering how this was possible.

Jace had been doing long division in his head for the past 15 minutes, his hips on autopilot as he slowly and consistently thrust into Lily. For about 10 minutes before that, he'd been experimenting with actually taking the half-step forward and then back necessary to draw his cock most of the way out before slamming back in. Halfway through that experiment, Lily had entered this state, but every few minutes she kept mumbling "more", so he figured she liked it. He wasn't in good enough shape yet to do that constantly though, so he'd decided to settle for just pushing in and out of her womb, and playing around with a few angles to see if he could change the tone of her moans by hitting one lung or the other. Limited success, as it turned out, and.

A spike of nigh-blinding pleasure ran through him, and he felt his immense nuts, at least half again as large by this point, heave as they prepared to unleash...

Jace SLAMMED his groin into Lily, reaching at least an inch deeper than before, and suddenly she was aware again, staring up at him as he howled with pleasure, until the first immense blast of cum hit her womb and she passed out entirely.

5 minutes later, Jace leaned heavily against the massive globe of flesh that was Lily's stomach. It covered the bed entirely, pressing her into it and blocking his view of everything but her lower legs. He was done now, the last spurt of cum had left his balls, although he could feel them refilling as he panted heavily. He had no idea how much cum that was, but he knew they'd be measuring it in liters rather than milliliters.

A sudden thought struck him. Could the collection machine even handle that much? But then he remembered this was all in VR. It had felt so real though, and he wondered if Lily had shoved him into the machine at accidentally just the right time, matching her VR version's leg move.

This was DEFINITELY a scene he'd have to remember, even if the leg move wouldn't be possible again. Jace made the gesture which brought up the VR menu, preparing to save, but...

Nothing happened.

A bolt of horror drove through him, and he reached up to remove the VR headset, but...it WASN'T THERE.