She aims the gun at her father’s back and...her brother storms in the room all pissed.

It all happened so fast.

Before Amanda could have pulled the trigger completely, her brother Robert came out of nowhere, reaching out to the gun. He managed to get a grip on the device and pull it towards him. A green lightning strike erupted out of the front of the gun, completely illuminating Robert in a green haze. As the lightning hit his shirt it burned a hole through it, creeping further to reach his skin. His whole body began to shake on impact as if he was being electrocuted. He fell to the ground.

“Oh...my...god! ROBERT! What the hell did you do?” Amanda yelled frantically to her younger brother. Her father, still oblivious of the whole scene, turned around to see his son lying on the ground and his daughter standing over him with a gun-like thing in her hand.

“A-amanda...? Wh-what did you do?”

“No no no no dad, it’s not what you think! It’s not a real gun...please, you have to believe me. It was meant for you!”

“What? Meant for me?!? Are you trying to kill your whole family?”

“No, it’s not like that...”

Bob rushed towards his son, of which he now knew was still alive. He sat down next to him, lifting his son’s head up on his legs to keep him from going unconscious. Little did he know how unnecessary this action was.

“It’s OK dad. Please, I’m fine, leave me the hell alone! I don’t need to be nursed by you! I..aaaahhhh”

A tremendous pain ran through Robert’s entire body. He arched over, showing his already impressive back to his family. But something strange was happening. It looked like his back was...growing?! It was widening itself, adding more muscles right before Bob and Amanda’s eyes. The tight t-shirt Robert was wearing quickly became several sizes too small; a split appeared exactly in the middle of his back, running all the way down to the lower half of the shirt.

Bob and Amanda looked horrified at the swelling muscles that were now exposed. Other ripping sounds could be heard; his time it were his swimming trunks that could no longer contain the growing thighs. Within seconds Robert was down to his boxer briefs and loose hanging shreds that once made up his outfit. Glorious muscles protruded right trough the fabric.

Next Robert let out an animalistic roar of victory. He straightened his back and raised both his arms flexing the most impressive double biceps both Bob and Amanda had ever seen. It was hard to believe that it was not on a bodybuilder on tv, but on their own flesh and blood right before their eyes. The peaks ripped easily through the remaining sleeves, shredding the entire shirt to bits and pieces.

Robert arched over again. His back was moving up and down from his heavy breathing. He was recovering from the change.

“Honey...what did you do exactly?” Bob queried his daughter.

“I...I...this wasn’t supposed to happen. Not to Robert at least. I..found this gun that said it could grow muscle, but I didn’t believe it. I wanted to test it out on you but Robert got in the way!”

“Well, isn’t that too bad” a familiar voice, yet several octaves lower, said facing backwards “did I mess up your LITTLE plan?!” At the word little, Robert put down one of his fists in front of him and shifted his newfound weight onto that one arm. He pushed himself up, placing his feet solidly on the wooden floor. Extending his legs caused his firm butt to raise into the air first, the remainder of a Hawaiian swimming trunk still draped around his thin waist. Next he straightened his back, setting his amazing visible traps and lats to work. His back must have been almost one and a half times as wide as it used to be, yet three times as ripped. The ray gun seemed to have obliterated any body fat that was once there, showcasing each individual striation in the muscles.

Amanda, intoxicated by her brothers transformation, could retrieve herself and quickly noticed the gun she was still holding in her right hand. She checked the dials; only +2 for muscle growth could transform her brother into an overdeveloped gymnast. She wondered what +10 would do then...

Robert had reached his new full height: 6ft4. He already was the biggest of the house, only 2 inches taller than his father, but this set the new standard. “I don’t think I can be considered LITTLE anymore, sis!” he said still facing the other direction. With his hands he torn down any remaining fabric still hanging tightly on his frame.

His head, resting firmly on top of a neck that was now flanked on both sides by impressive traps, started to turn. As soon as Robert’s eyes locked with Amanda’s, his shoulders started to move. Next, to keep up with the natural rotation, his entire torso was twisting. His waist still faced the other direction, yet his upper body was slowly being revealed. He shifted his feet the accommodate his turn. Amanda’s and Bob’s mouths fell open...again!

Two perfectly, well-crafted, slabs of rectangular muscle got into full view. Nickle-sized dark red nipples, placed in perfect alignment at the bottom of his pecs, completed his chest. Following downwards from between the obvious male cleavage were 8 individual abdominal muscles, neatly laid out in symmetrical pairs. A belly button was concealed in between the third row from the top. And further down south, revealed to its fullest when his waist had turned 90 degrees, was the bulge every 15-year-old would kill for.

The two massive thighs obviously pushed everything contained in the Hanes boxer briefs forward like free Viagra. Amanda couldn’t believe she was lusting over her own brother, getting turned on. When she quickly scanned her father for a reaction, it was obvious to her that he was enjoying the show as well.

Robert had now completed his turn, standing proudly, legs spread out for best support, arms hanging loosely down the side, waiting for the first reaction of his audience. “Man...thanks sis! I feel ggggrrrreat!!!” he yelled impersonating his favourite cereal mascot as he balled his fists to make a most muscular, flexing everything from his pecs, to his abs, thighs and biceps.

Amanda, still impressed, but also extremely jealous and frightened, took this split second opportunity to make the most important decision of the day. She had secretly turned the dials of the gun she was still holding up to the maximum and...