Bigger, Better, Fatter

Dr. Elena Voss stared at the Phase II data in the dimly lit conference room of NexFertility Therapeutics in South San Francisco. It was late 2024. The compound—internally coded NF-478, later branded CumMax—was supposed to be a targeted fertility enhancer. It upregulated specific Sertoli cell proteins and boosted spermatogenesis via a novel GnRH analog pathway, combined with a selective androgen receptor modulator designed to improve sperm motility and count without systemic hormonal disruption.

In rodent and primate trials, it had increased viable sperm output by 340–600%. Human trials looked even better on paper. Men with idiopathic oligospermia saw sperm counts triple within four weeks. Side effects seemed mild: slight testicular fullness, increased libido, occasional vivid dreams.

The FDA fast-tracked it under breakthrough designation. By early 2025, it hit the market.

Mark Reynolds, 34, software engineer in San Mateo, picked up his first prescription in March 2025. He and his wife Sarah had been trying for two years. His baseline count hovered around 8 million/ml—borderline. After reading the glossy NexFertility pamphlet ("Designed by fathers, for fathers"), he started the once-daily pill.

Week 1: Nothing dramatic. Maybe a bit more energy.

Week 2: His balls felt heavier, warmer. Morning wood became almost painful. He came during sex in under two minutes—embarrassing, but Sarah was ovulating and they were both excited by the volume. He produced noticeably more ejaculate.

Week 3: The hypersensitivity hit like a switch. A stray brush of Sarah’s thigh while they were spooning on the couch made him throb uncontrollably. He tried to hold back during penetration but lasted maybe 15–20 seconds before an intense, almost involuntary orgasm. The amount was shocking—thick ropes that overflowed and ran down her ass. Sarah laughed at first, then got quiet when she saw how mortified he was.

By week 4, penetration alone was impossible. The moment the head of his cock touched warm, wet flesh, his pelvic floor would spasm and he’d spurt helplessly. Even oral foreplay became risky. Sarah’s breath on his shaft could trigger leaking.

They adapted. She’d edge him manually for hours with lube and a loose grip, then mount him and grind slowly while he tried not to move. But even then, the slightest clench from her would set him off. The orgasms were longer, deeper, almost full-body. His testicles visibly swelled after each one.

Sarah started calling it “the CumMax effect” affectionately. She loved the volume and the way he trembled. Mark felt emasculated but also weirdly addicted to the intensity.

On Reddit, it started small.

r/CumMax was created in April 2025 by user u/PrejacPilot. The first post was a throwaway account:

“Guys… is anyone else on CumMax experiencing… extreme sensitivity? Like, I finish in seconds now. Doc says it’s temporary while my body adjusts. Wife is pregnant though, so mission accomplished? But holy shit.”

It got 200 upvotes in a day. Then the floodgates opened.

Dozens, then hundreds of men posted before-and-after sperm analysis screenshots (many faked or exaggerated for karma). Captions and memes exploded: edited photos of overflowing condoms, trembling legs during sex, wives grinning while their husbands apologized mid-thrust. Personal stories ranged from humorous to desperate.

One highly upvoted thread:

Title: “One month on CumMax. I can’t last more than 10 seconds. Wife says she’s never been more satisfied. AMA.”

Comments praised the “biological dominance shift,” the massive loads, the constant low-level arousal. Some men described their partners taking control—edging sessions that lasted hours, ruined orgasms, gentle humiliation play. A niche within the niche emerged: men who deliberately overdosed on 2–3 pills a day for stronger effects, leading to near-constant leaking and multiple spontaneous emissions per day.

NexFertility’s PR team initially celebrated the “organic community.” Then the tone shifted.

Dr. Voss was in damage control by July 2025.

Internal data showed the hypersensitivity wasn’t a bug—it was an unforeseen downstream effect. The drug massively upregulated both dopamine and oxytocin receptors in the pelvic nerves while lowering the ejaculatory threshold via altered spinal reflex arcs. What started as fertility enhancement had created a feedback loop: higher sperm production → increased testicular pressure and nerve sensitivity → hyper-responsive ejaculatory system.

Some patients reported permanent changes even after discontinuation. Testicular volume stayed elevated. Refractory periods shortened dramatically. A small subset developed what clinicians quietly called “CumMax Syndrome”: inability to penetrate without immediate ejaculation, paired with significantly larger semen volume and more intense orgasms.

The company issued warnings. Sales soared anyway. Fertility clinics reported record pregnancies.

Mark and Sarah’s life had transformed.

One Friday night in their apartment, Sarah straddled him on the couch, wearing nothing but one of his old t-shirts. She was already wet—she’d been teasing him with photos all day at work.

“Easy, baby,” she whispered, guiding just the head inside her. Mark’s hands gripped her hips, trying to stay perfectly still. The heat alone made his cock twitch violently.

“Sarah… fuck… I’m already close.”

“I know.” She sank down another inch. His abs clenched. A thick spurt escaped before he could stop it, lubricating her further. She moaned softly and kept going.

He lasted eight seconds total that night. When he came, it was with a broken groan—long, pulsing jets that filled her and leaked out around him in heavy drips. Sarah ground through it, chasing her own orgasm while he shuddered helplessly beneath her.

Afterwards, she stroked his hair. “I love what this drug did to you. You’re so sensitive for me now. So eager.”

Mark buried his face in her chest, equal parts shame and arousal. He had refilled the prescription that morning.

r/CumMax crossed 80,000 members by October 2025. It became a strange mix of support group, fetish hub, and pseudo-scientific forum. Long-form posts analyzed pharmacokinetics. Men shared lab results showing sustained high inhibin B and altered prolactin responses. There were “success” stories of pregnancies alongside “addiction” stories of men who couldn’t stop taking it even after conception.

Some wives and girlfriends created a sister subreddit. Others posted anonymously about how their once-average husbands had become hypersensitive, high-volume “prejacs” who now lived in a state of constant low-grade submission.

NexFertility stock soared, then plateaued as lawsuits loomed. Dr. Voss watched the Reddit numbers climb with a complex expression—part scientific fascination, part dread.

The drug had worked too well.

It hadn’t just improved fertility.

WHEN BIG ASSES COLLIDE!!! 👀👀🍑🍑😋😋🤤🤤

"Bigger, bigger, bigger~!!" Vanessa squealed as she thundered her ass against both of her friends.

"Not stopping! Never stopping! It's too goood~!!" Rhonda moaned as her clothes popped off her fattening, jiggling body.

Really feeling myself with these cute panties. Too bad my ass keeps growing bigger and bigger, now it's more of a thong than anything else.

But I wouldn't want it any other way, feeling this massive flesh clapping from any movement I do... drawing the attention of people wanting to stare at the source of all that thickness

*Sweeellll* *Clap* *Plap*

One guy sees what's going on and rushed home to his girlfriend to try and stop her from seeing it. But he's too late. She's been staring at her screen for over an hour, and her shirt is torn to shreds.

Cody rushed home, traffic lights be damned.

The seatbelt nearly strangled him as he leapt from his car, swearing as he fought to get it unbuckled.

Every passing second pounded in his head. The frantic jingling of his keys made the search all the more stressful. He had to get inside.

The doorknob left a small dent in the wall where it was slammed open. He stumbled into the living room and, as soon as he saw it, he lunged for the remote. Denial drove him forward. He had seen Beth's vapid expression. He had seen the shimmering, pink light dancing across the back wall of the living room. In his state, he couldn't accept that it was too late. He had to do something.

He snatched up the remote up from where it sat next to her, he placed his thumb over the power button, and, for the first time since he had heard the warning over the radio, he paused. He swallowed. His eyes roamed over the woman sitting on the couch, the woman that used to be his Beth.

He had never seen her like this before.

She looked... relaxed.

Her doctorate was well underway when he first met Beth. In fact, the first time he saw her was over a wall of reference books piled around her in the college library. He fell in love with her over dinner one night, listening to her try to explain the nuances of her thesis: analytic and algebraic topology of locally Euclidean metrization of infinitely differentiable Riemannian manifold. Just the title alone made his head spin, but it had represented years of work and effort. Every page of it carried so many sleepless nights and so many frustrated tears. She got a job offer even before finishing her PhD program, so she only had a week of respite between getting her degree and entering the workforce. She never took a sick day. She never stopped working, even when they were on vacation. The muscles in her back and shoulders had the kind of knots that would grant the masseuse who could untangle them dominion over some distant kingdom. Cody did his best to try and take her mind off work, but it never lasted very long. He wasn't upset about it, just worried. The money was good and Beth often talked about early retirement, but Cody secretly worried that stress would keep her from making it that far.

The Beth in front of him on the couch, however, had no such stress. For the first time in the many years of their relationship, Cody saw nothing behind her eyes: no stresses, no worries, no calculations, no thoughts at all. She didn't even react to him coming through the door. Sure, the buttons of her shirt lay strewn about the room. Yes, her breasts now rested on her thighs as she leaned forward to stare, blank-faced, at the TV. The swirling spiral on the screen reflected and glistened on the line of drool that rolled down from her chin and dripped into her growing, deepening cleavage.

Then, a realization struck Cody. It wasn't chilling. It wasn't comforting. It simply was.

Beth never watched television.

She simply didn't have the time for it and her focus was always somewhere else. She couldn't follow a plot line when she'd space out every few seconds to turn a 5-dimensional figure over in her head. Dialogue was more likely to frustrate her by interrupting her train of thought than to entertain.

Cody thought back to where the remote had been when he first picked it up: sitting right next to her, perfectly—and, perhaps, intentionally—placed. With new perspective, he reappraised the woman in front of him. All of the stress and all of the worry were gone from her face. Her muscles were relaxed. For the first time, she had nothing to ponder, nothing to think about at all. She had "joked" many times that her chest was her inspiration for pursuing mathematics, having so much experience with perfectly flat planes. Cody let out a wry chuckle at the thought of the old Beth trying to map the coordinates of new Beth's gigantic, round (though not perfectly spherical) tits.

A quiet moan from Beth brought Cody back to reality just in time to watch her breasts swell another cup size. Even with the buttons gone, a seam down the side of her shirt groaned under the stress, a gap widening just a little bit more. He looked at the remote. He looked at the screen. He looked back to Beth.

Resignation filled the sigh that rushed out of Cody, his chest rising and falling. He set the remote down on the coffee table and went towards the kitchen, stopping to kiss the top of Beth's head and give her shoulder a little, comforting squeeze. Only her breasts moved, rippling as the motion carried through them.

Cody could let her watch the spiral for a little bit longer.