Written for a trade with someone who wishes to remains anonymous. Cock theft, PE, strange transformation. I figured I might as well try my hand at something that I hadn’t done before; even though I’m not a huge fan of the outcome, I figure there’s someone who’s interested.

---

It was an average night for the house at the end of the boulevard. The sounds of grunts and rhythmic slapping, the smell of sex permeating the air. One man lying down on the king-sized bed, one leg splayed out, the other pulled out of the way. One man standing and thrusting into the other’s ass.

The tallish man on the bed, Evan, was currently a mess. His hair, normally prim and styled, was all out of sorts. He gripped onto the sheets in any way he could as his world was rocked around him. The one standing, Stephen, was a bear of a man. In every way Evan was thin and lithe, Stephen was broad and muscled. Thick hair was scattered over his body but especially over his chest and belly. He was just as lost in the moment, his eyes screwed tight as he thrust with abandon.

“Evan!” Stephen strained, “Babe, I’m gonna–”

“Do it,” Evan shouted back, “Yes, fuck yes!”

With a few final thrusts, Stephen came. Evan felt him slam deep into his ass, filling him up with rope after rope of cum. Stephen took a few deep breaths and slowly pulled himself out, and for the briefest moment, Evan frowned. Something felt off.

“Hm?” Stephen noticed immediately, “Something wrong, babe?”

Evan shook the thought from his head. “No, no. You were wonderful again.”

==

Evan shut the bathroom door behind himself and locked it for good measure. Something… wasn’t right. It was a different kind of wrong than earlier in the morning, but what just continued to evade him. After the twentieth time of superficially checking himself, he consigned himself to a more thorough search to find the problem.

He doffed his clothes one by one, checking himself over with each piece removed. Nothing was wrong with his toned arms. His legs were completely fine. Front and back, his chest was clear. It was only when he took off his underwear that a thought struck him. Was that really the right size for his dick?

He wasn’t dumb, he knew that flaccid sizes weren’t a set-in-stone thing, but this… looked different to him. Furrowing his brow, he wrapped his hand around it and started stroking himself slowly. He could work up himself up for his daily jerk-off later; he wanted to figure this out now.

As his cock hardened in front of him, Evan opened a drawer and pulled out (one of) Stephen’s cloth measuring tape. Stephen loved to pose with it and mark his progress, but Evan hoped he would mind it being borrowed just this once. He stretched the tape down his length, pressing one end against his base, and read the number at the tip.

He blinked at it and frowned. Six inches, on the dot.

That couldn’t be right. He was a full seven, and had been a full seven ever since puberty. Why did this change? He hadn’t felt this before. When he’d masturbated yesterday, he could have sworn that he was still his old size, but how…? He repeated the measurement, to the same result. How did this happen? He tried stroking himself a few more times, just in case he wasn’t yet at full-mast, but nothing changed.

He let the tape slip off his cock. What was going on?

A knock came from the door. “Evan?” Stephen asked, “You in there?”

“Yeah! Yeah, just…” he fumbled the tape back into Stephen’s drawer.

“You’re not using my measuring tape again, are you?”

“…No, I’m cranking myself off.”

“You know I can tell when you’re lying.” There was a sigh. “Just wrap it up tight when you’re done. I hate it when you leave it all tangled up.”

As he heard the footsteps fade away, he solemnly grabbed the tape again and began winding it up. The inches spooled up, but Evan couldn’t shake the thought from his mind. He was six inches apparently, not seven. How had that happened? Was he seeing things? Was this just a fluke? Was there any way to tell?

He set the tape down and left the bathroom. He needed to find something else to occupy his thoughts.

==

Evan woke in a warm glow. Stephen was a blast furnace to the people who slept next to him, as Evan’s thin sheen of sweat could attest. Evan gingerly extricated himself from Stephen’s prison of arms and legs, slightly sore after their late-night session the night before. He stood up and slowly stretched; another wonderful night, another wonderful morning. He grabbed his clothes for the morning and made his way to the shower, setting out a towel before he stepped in and flicked the water on.

He let out a sigh as the near-scalding water cascaded over him. The house always felt freezing on the bed-to-bathroom walk in the morning, and he found this made him complain less. He stretched and shook the tightness out his joints before turning to his morning mission, his morning wood. He reached down, fit his hand around his girth and–

…Hang on. His cock didn’t fit properly into his hand. Evan put the water to his back and looked down. He could tell something was different. In a flash, he suddenly remembered yesterday’s big revelation, that his cock had somehow shrunk down a full inch. But even now, without a measuring tape, he could tell that things had changed from even then. What was going on? Was he just going to continue shrinking? He had to tell Stephen about this. He’d chickened out over telling him earlier- how the hell do you bring up a topic like that? But he’d have to get over himself and tell Stephen. He couldn’t stay quiet about this.

Almost on cue, the bathroom door opened and Stephen half-stumbled in, still rubbing the sleep from his eyes. ‘No time like the present,’ Evan figured. He opened his mouth to speak when something caught his eye. Stephen had thrown on a pair of boxer briefs for God-knows-what-reason and was currently almost spilling out of it, not because he had thrown it on (Evan was an expert on this), but because it wasn’t fitting on him properly.

Because… he had grown.

Had he? Was Stephen seeing similar changes like Evan had? His eyes weren’t deceiving him, those briefs were definitely holding more than they should… So, were their situations linked? Was him shrinking making Stephen grow?

“Evan,” Stephen interrupted Evan’s mental monologue, “you’re staring. Do you need me to come in there and help you focus?”

‘Only one way to find out what’s going on.’ “Well, as long as you don’t mind getting wet, I wouldn’t mind the extra pair of hands.”

Stephen smiled as he rolled his eyes. He hooked his thumbs into his waistband and pulled down, the boxer briefs momentarily catching on his sizable bulge before letting them flop out. Stephen paused and looked down for a moment, confused, before shrugging and finishing pulling them off. “Probably an old pair,” he mumbled.

“You shouldn’t have even bothered throwing them on,” Evan joked as Stephen stepped into the shower. “What were you expecting to happen?”

“Not entirely sure. You’re definitely an adventure every single day.”

“I wouldn’t have it any other way.” He turned and presented his ass.

He chuckled. “Pretty sure that I’m the one who’s supposed to say that line.” Stephen took a moment to line himself up, grabbing hold of Evan’s waist, before easing himself inside. Evan had to suppress a squeak as he felt himself get spread apart. If he didn’t know any better, he’d just think Stephen was especially randy today. “You alright? I didn’t go too fast, did I?”

“No, no,” Evan’s strained voice wasn’t all that convincing, “You’re absolutely fine, babe. Keep going.” Stephen hesitated for a moment but slowly started thrusting away. As they settled into a rhythm, Evan tried to gauge if his lover’s package had grown. He figured he’d know immediately if it had changed, given all these years they’d been together, but he had trouble being sure through all the arousal. Was it really there, or was it only there because he wished his boyfriend had a larger cock?

His wishes of finding out discretely melted away with each thrust. Stephen was understanding, while he wasn’t one for measurements, he’d understand just this once, right? Evan succumbed a few thrusts before Stephen came. Just barely on the edge of consciousness, he slowly realized something- he was feeling stuffed, sure, but as Stephen finished cumming and pulled out, Evan felt more more full than he had been all this time ago. Maybe–

He glanced down, catching something out of the corner of his eye. His still erect cock seemed to shrink down ever so slightly. He brought his hand down next to his member to measure against it. Through his swimming mind, he came to a conclusion- it had shrunk down again.

Behind him, he heard Stephen take a few steps back and breathe heavily. “Jesus. Fuck, that was…” he sighed, “intense.” Evan glanced back to see Stephen leaning back against the wall, head back and eyes closed. “Have you been… training, or something?”

“Maybe a bit.” Evan glanced down between Stephen’s legs and immediately saw all the evidence he needed. Stephen’s dick was half again as long as Evan remembered it, slowly softening above a pair of balls that were definitely larger than before. If they hadn’t grown right then, he half wondered how Stephen must have fit them into anything, much less that poor pair of boxer briefs.

He thought about his situation for a moment. If his guesses were true, he was giving up his cock size (and probably his balls too) over to Stephen every single time that they had sex (he would figure out later today if it was just anal). In the back of his mind, something cautioned him, quietly questioning how permanent this would be or the potential ramifications of going too far. But there was another, louder part of his mind, front and center, telling him exactly what he wanted to hear.

Evan smiled to himself as he reached down and grabbed some soap. His life was definitely going to get more and more interesting.

==

The rest of the day, Evan had gotten creative with the sex he’d been having with Stephen. They’d gone through all manner of positions on his insistence, none of them leading to any changes that Evan could notice surreptitiously; oddly, Stephen had remained oblivious all the while. Anal, he concluded as he drifted off to sleep, was where the magic lay.

The next day, his excitement over further changes had prompted Evan to egg Stephen on for another round of anal, to the latter’s acceptance. It went over like all the other times before, inexplicable sizes excluded, with one notable exception right at the end.

Stephen had pulled out of Evan, looking down in suspicion. “Wait,” he mumbled, “what the…”

Evan started pushing himself up. “Something up, tiger?”

“Yeah, it’s–” he brought a hand to his face, “shit, you’re not going to believe me.”

“Try me,” Evan said. He’d seen impossibly things aplenty these past few days.

“My dick, it’s…” He turned it over in his hands.

“Good? Wonderful?”

“It’s bigger. How–”

“It’s called an erection, Stephen.”

“Evan, I’m serious. Look at me! This is not my normal size, I’ve gotta be–”

“A good four inches bigger?”

“I– maybe? This is… it’s impossible. What’s going on?”

Evan finished rolling over. Was Stephen finally putting things together? “I don’t know. Have you tried asking your amazingly sexy partner about it?”

Stephen looked up. “What are you–” his eyes widened in shock as he saw his partner’s reduced size. “Evan, what happened to you?!”

“Nice of you to finally notice.”

“No, I’m serious, you’re supposed to be tons larger than that!”

“Oh, you flatter me.”

“Evan, what’s gotten into you? What the fuck is going on?”

“Alright,” he sat up, “I’ll level with you: I don’t know. At all.”

“What?”

“All I know is that every time you cum in me, I go down an inch and you…”

The realization hit Stephen. “Oh, fuck… What’s causing this, how do we stop it, how do we reverse it?”

Evan blinked. “Whoa, whoa, whoa, easy–”

“’Easy’? Your dick’s disappearing bit by bit every time we have sex and you’re not panicking?”

“I don’t know, I wouldn’t say it’s total wash for me.” Evan leaned forward and tapped Stephen’s cock, still hard after all this time. “You get a bigger dick, I get more of a show. If I lose a few inches, so be it. Not like I needed them to please you.”

Stephen paused, glancing back and forth between his dick and Evan’s. “And you’re sure you’re fine with this?”

“I haven’t given up yet.”

He sighed, dragging a hand across his face. “Never expected this to happen today.”

Evan chuckled. “No one ever does. Random question: did you… really not notice this was going on until today?”

“Uh… yeah? Why? How long have you known about this?”

“Two days now. Has it really taken you that long to figure things out?”

“Oh, give me a break. We both know that you keep me on the verge of drying up.”

Evan glanced at Stephen’s noticeably larger balls. “Oh, I wouldn’t say you’re drying up…”

==

It had always been hard for Evan to keep his hands off of Stephen, especially now that he was in on the plan. His last few inches ticked away, much to Stephen’s growing dismay but eased by his growing cock. When that first round had wiped the cock off of him and the second had shockingly given him something inverted down there, both causing the same amount of growth on Stephen as before, it took everything he had to keep from pouncing on Stephen and pleading for another go.

In the days since, Evan had been all but begging for another round of anal any chance he’d got, but Stephen had gently pushed him into other types of sex. He kept mentioning that he wanted to “savor the size” instead of “speed-running the ruler”, which… Evan had trouble arguing against, even though Stephen was well past a single foot. Besides, he was doing this all for Stephen and his magnificent, growing cock; listening to him was the least he could do.

Evan sighed, stirring the soup and lowering the heat a little. Life went on, he supposed. Magically size-changing cocks or no. Stephen had been seeing a few “unseen difficulties” with his new endowment, but he still helped keep the house running. Especially those times when Evan had been taken entirely out by the some of the two to three sessions he and Stephen had gotten into the habit of. Given all the action, there was still a part of Evan that thought Stephen could still take more…

Evan heard Stephen unlock the front door and enter. “I’m back. Don’t know how we ran out of crackers, but we’ve got some now. And I don’t know why you had me run the errand.”

Evan chuckled. “What, and let you burn the soup like last time? Not happening on my watch. Besides, how else am I supposed to get you out in the public eye?”

“We’re not doing this for the public, Evan.” He tried to squeeze past to drop off his groceries, “We’re doing this for–” Stephen should have known better than to sidle behind Evan- just as he got straight behind him, Evan took a step back and pushed Stephen onto the counter. “…ourselves.”

Evan couldn’t help but smile at the little trap he had set. “What, can’t we have fun showing you off to the world?” These past few days, he’d been keeping Stephen growing steadily and the work had definitely paid off. That cock had now crested a foot and a half, and those balls were keeping pace. He ground his ass against Stephen’s bulge, savoring the unnatural sizes he had given his boyfriend. “How many people stared?”

“Plenty. Plenty of women, unfortunately, but I got a good share of men as well.”

Evan heard a creak in Stephen’s sweatpants and reluctantly relented. They were short on pants that could actually fit him, and the delivery for the new pairs would take a while. Now freed, Stephen stepped aside and quickly set down his groceries, then fished his swiftly-hardening cock out of his pants. Underwear, they had found, just stopped fitting him fine a week after they went all-in.

“Look at this,” Stephen mumbled. “I don’t think you fully drained me this morning. I could feel things churning and building up as I walked around the store. Half thought I was going to flood the place while waiting at the checkout.”

“Guess I’ll need to do a better job of emptying you before setting you loose, huh? Make sure your mind’s nice and clear.”

“It was when I was out there! Fuck, every minute it feels like these things are trying to fill me out.”

“I think I’m the one who they’re filling nicely, thank you very much.”

“Well, yeah. But I’m huge! God, it feels like I’m a scion of virility! I love walking around, knowing the biggest in the room and I love feeling like I’m going to blow open a pair of pants at any second!”

Evan tapped the end of the serving spoon against his chin. “And who do you think’s to blame for all this?”

Stephen chuckled, then reached out and spun Evan to him to give a kiss. “You, babe.” He stepped back and picked the groceries up again. “I’ll give you what’s yours after supper.”

“Can’t wait.” Evan smiled as he turned back to the pot to stir.

==

Things had slowed down in the days afterwards- not the sex, Evan had ensured that they were both well and truly sated, but the growth. Stephen was no longer gaining appreciable size, and Evan was no longer deepening his new anatomical addition. It was a shame to see happen, but they both figured that having two impossible anatomies like theirs was a gift enough to have.