Marla Trask smirked as she sat at the bar watching the local news.

“…and the Cincinnati Reds will have their open tryouts tomorrow at Great American Ballpark starting at 10 A.M. It’s open to everyone and you never know; you could leave the ballpark with a contract”

“Hmph…anyone my ass” Marla said to herself as she sipped her beer “You mean anyone with a dick”

“What are you mumbling about now” her brother Jeff said as he sat down on the stool next to her.

“Nothing” Marla said with a laugh. “It’s just that the Reds are having open tryouts and it said everyone is welcome and well, we both know that’s bullshit”

“You always were the jock” Jeff said.

“And you never had the slightest inclination to play sports” Marla said. “Dad made you play little league with me because I wanted to play”

“And I hated every second of it…it just showed how much better you were than me. Who wants to get shown up by their sister when it comes to baseball” Jeff said.

Marla looked at her brother; he really had been awful at sports whereas sports had been her passion. She had played baseball until she wasn’t allowed to play anymore, and then had switched to Volleyball, Basketball and Softball.

Jeff had totally distanced himself from sports. By the time the twins were in High School, Jeff had played Tuba in the band and gotten into the geek culture by reading comic books.

He shrugged as he opened his beer and took a deep swig from the bottle.

“Dude, I loved playing baseball” Marla responded.

“I know you did…but at least you got a basketball scholarship and a good portion of your college was paid for by that” Jeff said.

“You don’t get it…I’d give anything to play professional ball. I had a 70 MPH fastball when I was 13 and they made me quit playing. It sucked then and it still sucks now”

“I’d help you out if I could” Jeff said taking another drink.

“If only…” Marla sighed. “You should have been the girl between us”

Jeff nearly spit out his beer “Jesus Marla”

Marla just laughed. “If I was a guy, I could go to those tryouts tomorrow and blow every pitch by the chumps trying to bat” she slapped Jeff on his shoulder “And you could finally cosplay as Harley Quinn in public”

“Seriously?” Jeff deadpanned.

Marla chuckled and looked down at the bar as she peeled the label away from her bottle.  Her dark brown hair fell down into her vision and dangled above the polished wood of the bar. Her eyes trained back a bit to her breasts. She was wearing a black t-shirt over jeans and boots.

“Stupid things holding me back” she said to her body. “Could have been a pro if I was a guy”

“Tell you what” Jeff said “If I could transfer my Y chromosome to you for a day so you could try out; I would. I’d give you 24 hours as a guy”

“Thanks for nothing then ya goofball…it wouldn’t do me any good. If I only had 24 hours it wouldn’t matter how good my tryout was…I’d just turn right back into a girl…it would have to be forever” Marla said.

“Well what do you want…what would be in it for me?” Jeff laughed.

“What do you mean what’s in it for you; you’d have my love and admiration and thanks eternal…isn’t that enough” Marla leaned forward laughing hard.

They were both enjoying their joke as Marla added her usual retort “You should do it just because I’m older you know”

“By two minutes…you’ve told me that our whole lives” Jeff added sarcastically.

The moment had seemingly passed and the two continued talking about their days at work and the wedding that they had to attend in a few weeks.

“You want another one” Marla asked tipping her bottle towards her brother’s empty.

“Sure…why not?” he replied and she ordered two more.

The bartender flipped the TV over the bar to the Reds-Cubs game which elicited a strangled growl from Marla.

As she shook her head, Jeff patted her on the back “There, there little girl…you can’t go play the man game with the big strong men”

Marla half sighed and half laughed “Shut it” she replied with a playful punch toward Jeff’s stomach.

After a few minutes of watching the game, Marla stood up; she had the build of an athlete; 5’9” and 150 pounds. Her brown hair was shoulder length and she flipped it back out of her face.

Jeff too stood up. He was only about 2 inches taller than his sister but carried about 70 more pounds on his frame. He had fairly shaggy brown hair that he ran his fingers through. They stood the exact same way across from each other; right hand on their hip and their left foot turned out but Jeff slouched a bit more than Marla.

The twins looked at each other as Marla said “I still stand by what I said earlier…you should have been the girl and I should have been the boy”

Jeff smiled and shook his head “Yeah…okay…whatever sis”

They both picked up their beers to finish off the last swallow. Jeff smirked around the lip of his bottle as he closed his eyes and said “PAWS SREDNEG” and grabbed her elbow.

“What are you doing?” Marla said concerned.

“Remember: I’m doing this because I love you and I hope this turns out good for both of us” Jeff responded.

“What are you talking about?” Marla said as her stomach flipped. A slight jolt of electricity passed between them as Marla ripped her arm from her brother’s grasp. “What the Fuck Dude”

Jeff just smirked as he began to shrink and Marla began to grow “Enjoy what you wanted to happen” he said in an already slightly higher voice.

Jeff felt his heart rate increase along with a throbbing at the base of his skull. His stomach churned and he felt warm all over as his legs and arms went numb. He began to drop in height and weight and he took in a deep breath and tilted his head back to see his sister grow taller before him.

“What did you do?” Marla said, her voice deepening. She felt her shoulders and back begin to spread wider and her legs grow longer. She couldn’t help but notice that her brother was now shorter than her. His clothes were becoming loose as he continued to get smaller and smaller.

“Just watch” Jeff said as he looked up at least six inches to Marla as their height difference continued to grow.

Jeff lost seven inches in height, going from 5’11 down to 5’4” as Marla rose from 5’9” up to 6’4” and began to gain weight and muscle as Jeff dropped it.

Marla’s feet began to strain and push against the insides of her boots. The material wouldn’t give as her feet grew inside of them and she winced as her toes pinched in the ends and the sides of her feet wedged against their tight constraints.

She reached down and pried them off her larger feet along with her socks “What the…” she said upon seeing what her feet now looked like. They were several sizes bigger and her toes were longer and knobbier.

Her jeans had already risen up revealing her ankles as her height had increased but now as her legs began to become more muscled, the seams along her thighs began to rip and split. Power multiplied in her leg muscles, changing them into men’s legs.

She felt her muscles flex and tighten as the changes travelled up her legs. Marla’s ass tightened and rose up as her hips narrowed and came in equal with her muscular thighs.

Jeff settled in at his new shorter height and looked up at his sister as she tried to comprehend her changing body. His own changes were occurring just as fast.

His feet shrank down inside his white sneakers and he could feel his toes moving backwards in his socks as they got smaller. He lifted his toes and saw a tiny bump appear several inches back from the end of his shoes.

His jeans now hung low and loose and covered most of his shoes as the piled up over his short legs. As Jeff lost weight his pants became even baggier; he could have put his entire balled up fist in the gap that had formed at his waistline.

His jeans felt heavy on his smaller frame and seeing how his white t-shirt now hung down to his thighs, he pushed them down and stepped free of them, losing his shoes in the process.

Jeff locked down at his baggy socks and took in his pale smooth and skinny legs. His knees shook at bit from the sudden cold as his calves trimmed up and his thighs shaped up and grew round and firm.

His boxer shorts shifted as his hips and ass expanded outward giving him a womanly curve and shape.

Marla looked at him, her eyes wide with shock as she unbuttoned her tight jeans, frantically trying to get them down low enough for what was about to occur. “How did you do this?” she asked.

Jeff just smiled as he felt his penis numb and stand out fully erect. It tented out his shorts and then began to retreat. They both watched as it pulled inward making the bulge in the boxers slowly and methodically flatten.

His testicles pulled upward as well and with a distinct feeling in his stomach, Jeff knew they were gone. They pulled into his body cavity and became a part of his newly formed female organs.

His penis too had disappeared and Jeff pulled out the waistband to watch as the remaining skin reformed and folded over creating his vagina and clitoris. Moisture flooded forward to lubricate his newest addition.

“Oh” Marla said as she felt a severe cramp roll through her abdomen. Her organs were also reforming and repurposing themselves. She hooked her thumbs beneath her white panties and pulled them out as she felt her clitoris throb and hum. Her skin bulged and reformed into a sack that soon caught two rapidly descending testicles from her body.

Her skin lifted and closed around the clitoris head as it pulsated and tripled in size. It grew even more as a shaft formed up behind it and pushed it forward. In mere seconds, her panties were strained to their limit and she technically had achieved her wish of becoming a guy.

Marla’s waist widened as her stomach and abdominal muscles tensed and strengthened. Her back spread outward as did her chest and shoulders.

Her small breasts rose up beneath her bra, which had popped across her back as her entire torso grew larger. Marla’s breasts began to decrease in size becoming flatter and losing their roundness as they pulled back into her body.

Marla slapped at her chest and felt only the fabric of her tight t-shirt and the outline of her padded bra beneath it. Rips had formed in the seams across her shoulders but she could still feel her bra straps sitting there and she wondered if it would be the last time she ever felt that sensation.

Hair broke out all over Marla’s body as her pectoral muscles developed and surged forward. Hairs popped out all over her legs, crotch, stomach, chest and arms as testosterone flowed.
Her biceps and triceps burned as they grew stronger and stretched the skin on her arms in their rapid growth. Her wrists burned and her fingers pulsated as they too grew. Her fingernails were already short but now they came in and squared off even more as she felt strength pulsate through her.

Jeff’s waist tucked in and his stomach came in quite a bit as well but still remained soft as all hair disappeared from his body. His back shrank down and pulled inward taking his shoulders with it as they rounded off and dropped down. His ribs and chest contracted in causing his t-shirt to billow slightly.

He felt an increase in the sensitivity of his nipples and a burning sensation in his chest as breasts began to form up and grow. They pushed out slightly at first with a quick puff that made his nipples rise up and thicken.

More and more flesh built up though and steadily pushed forward as they grew larger and larger. His t-shirt began to rise outward as they built a shelf behind it. Jeff’s breasts were full and round and pert on his small chest.

Jeff’s arms grew shorter and thinner as his muscles redefined themselves too. His hands shrank down and his fingers thinned greatly as his nails grew longer and rounder on his fingers.

Marla’s neck muscles thickened and looked like cords and her Adam’s apple popped out as her head began to reshape itself. Her hair rose up from off her shoulders and tucked itself back until it became a close cropped man’s style. Her chin jutted out and her jawline strengthened.

Stubble broke out across her chin and upper lip and the sides of her cheeks as those too changed, dropping down and blending in better with her broadening nose.

Marla’s lips thinned and her teeth grew larger inside her bigger mouth. Her brown eyes narrowed as her lashed thinned and her brows thickened. Her ears grew longer as her forehead and brow line rose up.

Jeff’s neck thinned and elongated as the front went smooth. His brown hair began to grow longer. The shaggy cut on the top turned into bangs that covered his shrinking forehead and thinner eyebrows. His brown eyes widened and his eyelashes became prominent as his brown hair grew long and wavy down his neck and back.

He looked much more feminine than his sister ever had as his nose shrank and thinned to a ski slope like end. His lips plumped even as his mouth shrank small and his teeth became tiny inside his mouth. All signs of hair vanished as his skin became flawlessly smooth and pale.

His cheeks rose up and rounded as his chin and jaw pulled in and softened. His ears rose up and became smaller and two small holes appeared in each lobe.

“Finished” Jess said to her brother Mark with a definitive nod of her head that made her hair bounce and tickle her ears.

“Holy Shit: What happened to us” Mark asked once more.

“What you wanted to happen to us” Jess replied. “You kept insisting that you should have been the boy between us; and now you are”

“But…but…” Mark said looking down at his powerful, athletic frame.

“Tsk, tsk, tsk” Jess scolded “Don’t worry about how…just thank me that it is”

“Uh…Thanks…um…sis” Mark said.

Jess blushed with pride and happiness. “You’d better get home and get some rest; you’ve got a big day tomorrow at the ball park”

“Um…yeah…I guess I should” Mark began to make his way out of the bar in his ill-fitting clothes. No one seemed to notice or mind what was going on or what had happened to them; it was just two poorly dressed people quickly exiting a bar and heading to their cars.

The next day…

Jessica Trask sat in the bleachers watching and cheering as her big brother won over the eyes and minds of a group of Major League scouts with his raw talent.

After the tryouts were over, she hopped out of her seat and rushed down to the railing at the side of the field by the dugout. She was wearing white sandals, a white skirt, a red tank top and a light white sweater over the top. “Congratulations” she said as Mark came close. “It looks like you’re the only one that they wanted to talk to…”

“Yeah, they want to talk to me about a contract” Mark said blushing. “How can I ever Thank You”

“There’s really no need big bro…This is what I always wanted anyway” Jess said with a smile as she turned and walked up the stairs.

“Where are you going?” Mark called out.

“There’s a Comic-Con starting in town tonight…I have to get my Harley Quinn costume ready” she said with a wink.