(changing it up a bit so Alex hasnt outgrown his pajama's just yet but visibly is bigger, sorry if this doesnt vibe but just felt it would help the idea i have)
You gawked at your brother whose body was broader than it was before, his newfound muscles tight and apparent under his pajama shirt and pants that looked to be in a losing battle against his newfound frame. Especially that slight bit of bulge where his naughty bits would have been. As Alex rolls over on his side grumbles in his sleep as his roll puts him closer to your body , you slide away to get yourself a bit of distance between you and the bigger boy.
"T-this is fine...." You say with deep worry, as the nightmare that wracked your mind before makes you shiver to your core and wonder how Alex would treat you once he woke up. Maybe there would be some scorn and malicious intent now that the power dynamic was slowly shifting in his favor or maybe nothing would change. Nothing was ever so certain but first come first serve...you had to get outta this...wierd space where it was your home but everything was just bigger.
With a hesitant hand you reach over and touch his shoulder to give him a little shake, you could feel the thickness of the muscles underneath as unintentionally you felt up his newfound swimmer build. In your mind, you were quite impressed how they felt, strong yet soft as his sleeping body didnt flex but you could feel if he did it would be a fascinating time. A low moan comes from Alex as he bats your hand away wanting to sleep more, you wont let that slide as you move over and sit atop of him lightly. Your butt can feel his 4-pack below you and a part of you finds the position was bit compromising. However, that wont stop your goal as you grab your brothers chest feeling up his lithe pecs and giving him a few more shakes.
Alex groans and moans again as he wishes to stay asleep, his arm moving to grab your legs as his eye's finally open and meet yours with a disgruntled glare. "Whaaa..." Alex says in a disgruntled groan releasing from his lips, his voice extra raspy as he tries to wake up. "Did you have a good sleep...cauuse...we need to grab the key...and there's something you should know." You tell him as his face looks a bit annoyed. He looks up to were the key was, then looks back at you, "What key..?" Alex asks in tired dissappointment as you look back at him bewildered. "What do you mean? the key hung right next to the..." As you begin to clarify you look up to see the key was gone. In fact thats not the only thing as the kitchen seemed to have warped and shifted around you two, the world shaping mysteriously into something else as it swirls and shifts all over.
Your gaze falls to your brother who you were still atop of, and his to you, as you both witness the world shifting and changing before finally it stops and lands on the two of you in Alex's bedroom. In fact you were on his bed with the boy laying atop of his covers however things were just as massive as the world felt as though someone a good 40 ft tall lived there. The two of you barely taking up the halfway point of the bed but you were sure it was still your house or whatever this weird world was making your home to be. "Shit...." You mutter as you look around a bit panicked and worried about how this could possibly happen as your mind is hard-pressed for answers. "Mm..rrg.. b-bro.. I'm feeling something..." Alex moans under you. You look down and see how his face seems to be wracked in pain and pleasure as well as his body wrapped in a growing heat.
However soon it gets revealed that whatever happened while you were sleeping with Alex was happening before your eyes as his body began to swell and grow. Under your hands, you can feel his pecs swell and thicken becoming harder and bigger as they fill up your hands. The boy moans as you unintentionally grope them as they grow like thick squashes of muscle, with his pajama t-shirt ripping down the middle from the growth. Alex's shoulders broaden thicker in turn as his muscles swell and grow into his bicep
making them like softballs in thickness. His body is in flex as he continues to swell and grow as his 4-pack becomes a 6-pack of chiseled abs causing his pajama shirt to rips off revealing his muscular top. The bottom half of his body not missing out as his boy ass bulges and thickens with muscle. Hearing the sound of those pajama pants ripping and tearing apart as his legs and calves broaden. Then finally Alex's hips buck hard as his bulge throbs bigger and bigger, his moans intensifying as it soon rips from its cloth prison and flops onto your back feeling about as big as most of your torso, maybe 13 inches if you had to guess. As Alex's moans still resonate through the room his grip on your legs tightens as his body then grows tall. Making every part of him way bigger than you would think reasonable for a little brother as his body gets to your height at 6 ft tall. The two of you stare at each other and his one hand explores one of his pecs.
"So...is this what you wanted to tell me?" Alex mentions loving every moment of having such a muscular body like a little athlete, altho nude he was nearly o sexy to ignore. Taking up all your mental power to just not get a hard-on at the moment. His cocky knowing smirk turns back to you as his cock throbs against your back, his hips slowly bucking grinding it up and down more and more.
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