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Please don't hate me! This one is a bit shorter then previous parts, but Part 6 will be a much longer installment. Also the hate me part will prob come from where I stopped, but if you guys read the original transcript, I'm pretty sure your going to be begging me for the next part! 

Previous Parts:

-Part 01 - Part 02 - Part 03 - Part 04 -

Part 5

The Experiment

Matt continues to feel weak for several minutes. His mind drifting in and out of consciousness as Andrew’s apology rings throughout his head. He slowly comes to his senses; eyes popping suddenly wide open. Matt sits up, groaning, feeling completely awful.

“What the hell just happened?” Matt muttered under his breath. He slowly pushes himself off the floor from between Andrew’s legs. Standing up on shaky legs, Matt staggers away toward the bathroom, having to reach down several times to pull up his shorts. When he finally reaches the sink he hesitates at first before looking into the mirror.

What he sees makes his blood run cold. Matt is clearly shorter then what he was before, and his muscles, while still large, are no longer the huge size they were minutes ago. Where his head used to reach to the top of the mirror – now it’s a good four inches lower. He snorts in aggravation, walking over to the scale. As he steps onto it the hand flies to the right, landing on 250lbs. He couldn’t believe it; just last week he stood at 300 lbs.

Matt closes his eyes for a moment, trying to think. Something sparks. His mouth dropping as he opens his eyes and spins around heading back to where his brother sat on the couch. “Andrew, I think I know what’s going on. But we need to test it to see if I am right.

Andrew looks at Matt confused. “Umm, Ok?”

“Something in our cum is doing something to us… Something weird…” Matt turns from his brother, walking into the kitchen, coming back with a pair of cups. He hands one of them down to Andrew. “I want you to jerk off into this, and I’ll do the same with my cup. And when we are finished, we’ll each drink the cum and we will see what happens.” It’s an insane plan, beyond ridiculous actually. But something in the back of Matt’s mind tells him he needs to know if this is what is really going on between them.

Andrew continues to look up at Matt from the couch, confused. He’s still shirtless and just in his boxers from the previous encounter, his cock pulled to the left and held tightly in place when his cock begins to twitch a bit in excitement. Andrew also has a feeling that their cum is the cause what is happening to them too. “I don’t think that is a good idea, Matt. I mean, I think this might cause another change.”

“I think so too.” Matt looks a bit nervous, but he doesn’t care. “That’s why we need to test it. We have to know if it’s the cum or something else. I have a very good feeling it is our cum that is doing this to us… As crazy as that sounds.”

Matt takes his cup and pulls out his cock right in front of Andrew, holding It right above the lip. Closing his eyes he strokes his large piece of meat. Matt can feel it is smaller then what it was, and Andrew notices just by looking it isn’t the massive 10 inch monster he used to be so proud of. Matt’s Legendary 10 inches has been reduced to a generous 8 ½. Matt pumps it slowly methodically, holding it in one hand and the cup in the other.

As Matt strokes himself off, Andrew takes notice of other things. His brother’s shirt is no longer as tight as it used to bel the oversized garment hangs loosely off his still-muscular, but significantly-smaller frame.

Andrew hesitates at first, but slowly peels the front of his underwear down. His 5 ½ inch cock popping out free, along with his new, massive forest of dark pubic fur. He reaches down, wrapping his hand around his cock, putting the plastic cup between his legs. The head of his cock over the top of the cup as he begins to jerk off his own member.

It feels so good in his hand; it’s the first time he has really taken notice to his new size. It’s the first time he’s actually got to handle his own cock this much since this whole ordeal started. Andrew looks up at Matt, noticing his brother looking right at him intently working his own cock over. “Are you ok, Matt?”

Matt begins to stroke his dick harder as he looks on at Andrew. Both of them gazing at each other in a somewhat lust and desire. Matt pumping his meat with gusto. With a loud grunt, he exhales, shoots, pumping his load into his cup.

Matt breathes heavily as he strokes the remaining dollops of cum from the inside of his shaft, squeezing it and making sure he got every last drop out of it. “Doing just fine, Andrew. Just studying your body. I want to see how you do when you drink this. I’m guessing you’re going to do very, very well.” Matt smiles ruefully down at Andrew. Making magic cum is fine and all, but if his balls churn out this magic growth-cum, why does he keep shrinking? His suspicion, of course, but it’s about to either be confirmed or proven wrong.

Andrew continues to look over Matt as he too continued to stroke his own dick. He begins to feel his balls churn, pull up. Andrew leans forward, grabbing the cup between his legs. “Oh FUCK!” He grunts as he shoots, and shoots… and SHOOTS… Andrew begins to pant between his grunts as he doesn’t feel his cock stopping until he fills the cup a bit more then ½ way full.

Andrew looks back up at Matt, a quizzical look on his face. Matt’s cup doesn’t have nearly as much as Andrew’s contained. “Uh, you don’t have to drink all of it, Matt.”

Matt takes a step forward, handing his brother his cup of spunk that he just produced, taking the cup that Andrew was holding and just filled up. “No sense being a wuss about it now,” Matt said in his old cocky voice. Placing the cup at his lips, he tips it back and chugs the entire thick fluid down.

Matt winces, feeling his body react to the bitter substance. The familiar feeling of weakness coming over him again and making him feel… less… than he was before.

Andrew just sits back, watching in horror. The cup of Matt’s cum still in his hand as he watches on as Matt begins to shrink right in front of him. For the first time, they can both see what effect Andrew’s cum has over his brother.

Andrew puts the cup of cum on the coffee table, getting up, wrapping his arms around his shrinking sibling. “Fuck Matt!” His arms shifting around his brother’s body as Matt’s lats collapse inward slightly. He begins to descend slightly in height. Matt’s body is wobbly as he leans into Andrew for support as his muscular legs feel weaker as he compacts an inch all over his entire body as his body mass loses 10 more lbs of muscle. And his cock, slowly retracting to 8 inches.

He clutches onto Matt’s body more tightly. “I can’t drink it, bro!”

Matt trembles for a moment, then wraps his own arms around his twin. He’s still bigger, still stronger then Andrew. But he’s quite a bit smaller than he was before. “You’ve got to, Andrew. We need to know. And hey, it’s not so bad, right? If my cum works like I think it does, you’ll get bigger, not smaller. That’s not so bad, is it?”

Matt smiles down at Andrew, sadness in his eyes as he knows there is no going back, the only thing they can do now is move forward as he bends his neck down and places a soft kiss on Andrew’s lips. “Come on. Just drink it. It won’t hurt you. A hundred bucks says you’ll feel better afterwards.” He looks at Andrew seriously, and Andrew can see that Matt really wants him to drink down his seed.

Andrew hesitates, moves over to the table, and picks up the cup. He lifts it up to his lips, his eyes never breaking contact with Matt as he pushed the cup back and feels the warm salty cocktail that Matt made produced from his manhood slide down his throat.

Andrew’s eyes open wide as he drops the cup. A feeling of warmth washing over his entire body as he begins to breathe harder, grunting in pleasure. His body tingling as Matt’s seed begins to fuel his muscles. Andrew’s entire skeletal structure shifts and pops, growing upward and broader as his bones grow to accommodate the incoming new size. His body gaining another inch in height. Andrew’s muscles tense all over, throbbing gently, growing bigger with each pulse of his heart beat as 10 pounds of muscle packs onto him.

A moan escapes his lips as his cock and balls tremble and jerk as they bloat a bit larger, fuller, more potent. His dick becoming rock hard, looking a bit over 6 inches now, jutting a bit further out from his forest of pubes he’d grown.

“Fuck, it does work!” Matt watches in awe. His clothes even looser as he sees the boxers around Andrew’s thighs pulling even tighter.

“We can’t do this anymore,” Andrew pants, breathing hard after this new dramatic growth that they now both know what the actual cause is now. “You’re going to keep shrinking, Matt. And it just feels like the world is changing. I can’t get bigger then you, Matt.”

The look in Matt’s eyes though seems to tell Andrew more of what’s going on in his brother’s head. If it wasn’t for his facial expressions, Andrew could easily tell what Matt was thinking by his brother’s growing cock after seeing him change a bit.

“Are you fucking kidding?” Matt said, finally back to his normal demeanor as he tossed his empty cup aside. “I have the power to make you bigger, stronger… tougher. Why wouldn’t we do that? I don’t need to drink your cum. Fine. No reason though why you can’t drink mine though!” He looks down at his dick, noting it has boned up to its full hardness again.

Matt steps closer, pulling off his shirt and tosses it aside. His torso is still beautifully-muscled, but no longer has its prior impressive size. It’s also completely smooth, missing the carpet of masculine fur that once covered it. He tenses his pecs and abs slowly, making the muscle bulge under his skin. Slapping his flexed abs, striking them like a drum. “Come on, Andrew. You saying you don’t want to get a bit bigger? A bit stronger? A bit sexier?” Matt’s voice trails off into a seductive growl.

Andrew places his hand on Matt’s smooth pec, not having to look up as much anymore to see his brother’s face. “I don’t Matt. You make me feel comfortable. I don’t want to lose what we are gaining back after all these years.” Andrew wraps his arms around Matt in a hug.

“We need to stop this all together. No more blow jobs. No experimenting. No fucking. If our size difference continues to shift, I won’t see you as my big lug of a hunk brother anymore.”

Andrew shifts his eyes downward, looking a bit depressed. “I just wish there was a way we can continue to play without the risk…”

To Be Continued…

Coming Soon Part 06: Risk Takers

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asianman2410

Love it! Jurai! It finally becomes clear what's going on. After re-reading this a few more times, I finally understand and should've seen the direction you were going in. I'm curious what the next chapter entails. 

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57 minutes ago, asianman2410 said:

Love it! Jurai! It finally becomes clear what's going on. After re-reading this a few more times, I finally understand and should've seen the direction you were going in. I'm curious what the next chapter entails. 

Thank you for the kind words! I hope to do well with the rest of it as well. It's a theft story, but it's not your typical revenge theft story.

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asianman2410

It's kind of a cool concept that one guy can grow whoever he wishes to, but it sucks for him that his brother can only have the opposite effect on him. I do kinda hope he gets back some if not all of his size, but it's still a hot story. Definitely a lot of options where you can still go with it. 

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BoneMonkeh

This has got to be one of my favorite stories on here.

  • Upvote 1

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5 hours ago, BoneMonkeh said:

This has got to be one of my favorite stories on here.

Thank you for your kind words! :)

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Kymuscleboy

This last chapter was really great.  Andrew is starting to become really manly. I like how Matt is almost entranced to willingly give up his size to his brother, even though part of me is yelling at him while I'm reading!  I'm still waiting for his friend from the gym (his name escapes me at the moment) to decide he wants another round of growth. At this point Matt would be powerless to stop him I think. The fact that Matt is still willing to help his twin grow even knowing the risk that he could regress more really says a lot about the brothers' relationship and adds a lot to the story.

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