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The First Catalyst [A Man to Woman Sci-Fi TG] - Part 4
🕑 Added 2025-08-07 21:00:37 +0000 UTCComissioned by Cooolooo
Part 4
Zach’s skin was warm, not feverish, but she could feel the blood and hormones pumping just beneath the surface. As soon as she opened her eyes, she knew something had changed. She was nearing the end of the transformation window, at least she thought so, without the documents, it was hard to tell. Regardless, she had thought all the major changes were done, but as she sat up, it became clear how wrong that assumption was.
Her chest was so heavy, her breasts were at least another cup size larger and hung in beautiful, womanly teardrop shapes from her chest. Zach hefted with a mixture of panic and awe; the growth had been so gradual, and now, overnight, she’d increased to the point that no wrap would ever hide it.
“Where did all this extra size even come from?”
Zach swung her legs over the side of the bed and carefully got to her feet, adjusting to her new centre of gravity and discovering she was several centimeters shorter.
“Dammit, none of my pants are going to fit now…” She muttered, “IS that where these new tits came from? No, it can’t be…”
She hefted up the breasts again, letting them fall and watching the supple flesh jiggle slightly as they came to rest. Her hands felt delicate against the soft skin, not to mention small. Not just small compared to her tits but everything else as well. With some difficulty, she turned on her toes, examining her feet and finding them the same. It was as if her limbs had been shrunk ever so slightly, becoming dainty.
Immediately her mind went to the heavy door and the way she gripped it, the tools she used around the farm, even her utensils at dinner: how was she going to hide this? Gaining some weight was one thing but how was she going to explain away that her hands had changed shape?
“Oh boy….my face!”
Sudden dread crashed over her like a bucket of ice, and she dashed for the tablet and held it in shaking hands as the camera took a painfully long time to open. When it finally did, she breathed a sigh of relief; her face was the same. Soft, but tomboyish, her hair was still the same short cut it always had been. Visions of herself with long flowing hair vanished, and Zach’s heart stopped thundering quite so hard.
“Okay, this is manageable…” She looked down at her new bust. “Mostly.”
The sun was only just starting to rise, it was time for her normal workout, but something kept Zach frozen on the spot. She imagined trying to do pushups and these new breasts crushing against the ground; her delicate hands shaking as they desperately tried to hold her up. There was still muscle on her arms, but somehow it seemed diminished. A little voice at the back of her mind whispered cruely that if she tried, she would just fail.
“Maybe I will just get straight to work.”
Zach bit her lip, then clicked her fingers as an idea occurred. The drones! It was still early, if she snuck out to the barn and got the drones working early, maybe they could help her, then Alex would never know she hadn’t done it herself! That promise to tell Alex when she couldn't do the work lingered guiltily at the back of her mind as she snuck down to the barn, but she rationalised it away.
‘I don’t know for sure that these changes make it impossible, I’m just getting ahead. It doesn’t count.’
Zach reached the barn and grabbed hold of the heavy door; before she’d even started to pull she knew she was at a crossroad. With a heavy tug…the door stayed put. Zach braced her feet, gripped the cold metal with both hands and heaved with all her strength, the door groaned slightly, but stayed still.
“No!” She cursed,
The extra boob weight had drained what little muscle she had desperately clawed back over the past few weeks. All that hard work, all the sneaking around, it had been for nothing! Wiped out in an instant. Desperate and in denial, she kept at it, pulling on the door with everything she had. All that work had kept up her endurance; there was that at least, she wasn't tiring out, but she just didn’t have the strength to open the heavy door.
This was it. The final straw. Zach’s blood felt like ice in her veins; she was going to have to tell Alex now. What’s worse, how was she supposed to protect him now, in this body? That cold blood pounded in her ears as the panic began to mount. She had no idea how she was going to confess, or what Alex’s reaction would be. If she could just get this damn door open she could keep hiding, keep the pain away for just a little bit longer.
“Dammit! Come on, just open!” She growled, grabbing the door one final time and channelling all her frustration into the pull.
The metal groaned, then started to move. Zach’s eyes lit up only to immediately fall as she spotted a third hand on the door.
“Alex!” She spun around, and suddenly, warm arms were enveloping her. The hug was tight, and her body instantly melted into it. Even with the shoe lifts she was shorter than Alex now and buried her face in his neck. He smelled like home. They stood there for what felt like minutes and hours simultaneously before pulling apart. Zach shook her head and sighed.
“You knew.”
It wasn’t a question.
“Yeah…”
“For how long?”
“Since that day with the 3D printer,” Alex admitted, “I was suspicious before then, but that cinched it, you do know the printer keeps a record of everything it makes, right?”
Zach resisted the urge to smack herself in the forehead.
“When you started wearing those baggy clothes every single day, that confirmed it.” Alex continued, “When you first started acting weird, I contacted Homebase and saw the register of delivery.”
“You’ve known about the catalyst this whole time? I thought I was doing a good job of hiding it.”
Zach pouted and then jumped in shock as Alex’s hand pressed against the side of her breast with a playful grin.
“You thought I wouldn;t notice tits this big?”
They blinked, then both burst into laughter. Zach braced herself on her knees and wiped away tears, she could see her shadow on the ground as the sun rose higher; even her silhouette left little to the imagination. She really hadn’t been hiding them at all.
“Now that you mention it…it’s kinda obvious.”
“Only kinda?”
Zach snorted.
“If you knew, why didn't you say anything? Why play dumb when my dad brought it up?”
Alex looked away for a moment and rubbed his arm slightly.
“I was waiting for you to trust me.”
The words felt like a physical blow; the air rushed from Zach’s lungs as Alex’s eyes met her again, and the guilt welled up even higher than it had before.
“I figured you took the catalyst so I wouldn’t have to, so I wanted to wait for you to tell me yourself, rather than ‘finding out’.”
Zach bit her lip.
“Sorry, it wasn't about not trusting you or anything, it was about-”
“Protecting me. I know.” He smiled fondly, “Zach, I know you like to take care of me, but I am a grown man, I’m not made of glass.”
“Well, apparently I am.” Zach half joked, “Can;t even get this damn door open anymore.”
“It is really heavy…” Alex muttered, peering down at the metal and then raising an eyebrow. “You know this is a sliding door, right?”
“...Alex, I know I’m not the sharpest knife in the drawer, but even I know what a sliding door looks like.”
“Yeah, but it’s a metal door outside on rollers, have you tried lubricating the wheels?”
Zach’s mouth opened. Then closed. Then it opened again. Alex just laughed and headed for their toolbox, producing a can of spray. After a couple of shakes he started spraying the lubricant over the edges of the door rollers before motioning for Zach to give it a try. She gripped the door and pulled; it was still heavy but it moved easily, rolling open with a fraction of the effort needed. Alex raised an eyebrow.
“You didn’t think to check?”
“I did not.”
There was silence for a beat before they both laughed again.
“It’s just like you to brute force your way through everything, to your own detriment.” Alex shook his head, “I guess some things never change, catalyst or no catalyst.”
Zach blushed and went inside the barn. Quietly, they went about their work, herding the cows outside and getting the drones booted up. Once it was all done, Alex sat himself down on a spare bale of hay and patted the spot next to him.
“So, what now?” He said as Zach joined him.
“I guess I stop hiding.”
Feeling self-conscious, Zach shed the extra layers she’d put on, finally showing off her new feminine curves. It might have felt weird, stripping down to just boxer shorts and the wrap that unsuccessfully hid her breasts, might have felt weird if it was anybody but Alex. They’d gone through school together, shared a locker room, it didn;t occur to her until her baggy clothing was off that her new body made the situation different.
“Damn, you really can’t hide those things.” Alex chuckled, “We’ll get you a proper measurement and bra, your back must be killing you.”
“The wrap helps.”
Even as she said it, her back twinged with strain.
“Why did you think you needed to keep this from me?” Alex asked seriously.
Zach took a deep breath and let it out.
“I didn’t want you forced into changing, but then when I started to transform, I worried you wouldn’t like the new Zach. I was scared I couldn’t protect you like I always have, and if I can't do that, what’s the use of me?”
“Zach, you’re my friend, our relationship isn’t a transaction, I like you because you’re you, not because you punched bullies in high school.”
He reached forward and took Zach’s hands in his own.
“I’ve always admired your strength, but it’s your courage that I admire the most. You’re always putting other people ahead of yourself. Trying to do what’s right by them.”
Zach swallowed the lump in her throat.
“I guess I can’t go by Zach anymore, so how about…Zoey.”
“Zoey….I like it. It suits you.”
“I still can’t believe you knew this whole time.”
“I thought you’d be angry if I called you out, but when I saw you struggling with the door this morning, I couldn’t take it anymore. It was the door that was the problem, not your body. I couldn’t let you keep panicking like that.” He paused for a moment, “Besides, I need to get into the barn too.”
They snickered, and Zoey leaned forward to wrap her arms around Alex once more. That feeling of rightness flowed over her only to be slightly ruined a second later.
“Uh, Alex?”
“Yeah?”
“What’s that poking me?”
“....In my defence, you never put your shirt back on.”
“Oh.”
She took a step back and let out a breathy laugh as her cheeks turned pink. She looked at Alex and took in his face, a face she’d known for so long but it was like she was seeing it for the first time. He was handsome and in so many ways, she was already in love with him.
“Well, I think it’s only fair that you be shirtless too.”
Alex swallowed and reached for the hem.
“I guess you’re right.”
He lifted his shirt over his head and threw it to the dusty ground. They had the barn to themselves with the cows and drones out working, and despite the slightly odd location, it felt intimate. Zoey silently breached the small divide between them and ran her delicate hands over his smooth chest. Alex wasn’t muscular, but he wasn't without definition. That tent in his pants grew slightly, and a dark spot appeared at its crest. Zoey couldn’t help but grin seeing it; it felt oddly empowering to know that was for her.
Still, her heart was racing with nervous energy as she stretched up to cup his face and press their lips together. That feeling of rightness, of home, was even stronger than the hug. Any reservations she had about crossing this boundary between friendship and more were gone in an instant; this was what they were supposed to be.
Alex’s hands reached up to hold her face and returned the kiss. It was gentle at first, chaste, then Zoey parted her lips and their tongues began to dance. Zoey yielded immediately, part of her felt strange, being the smaller one, but the other part didn’t care. It felt so nice to have somebody else take charge and take care of her for a change. Alex’s fingers cupped the back of her head, threading through her short hair and gripping it almost tight enough to hurt.
Zoey’s own hands roamed, brushing over Alex’s belt and expertly opening the buckle. Her fingers trembled, she wasn't sure if it was excitement or nerves, either way she was buzzing with energy. Their hands got more urgent, Alex pushed down Zoey’s boxers, and with a wiggle of her hips, they were on the ground, and she was naked.
Alex took a step back to admire her, looking up and down her curvy body before placing a gentle hand on her chest.
“This looks uncomfortably tight.”
Zoey’s mouth went dry.
“You could help me take it off.”
“With pleasure.”
Removing the wrap wasn’t as sexy as removing a bra. It was slightly awkward and required Zoey to spin slightly on the spot as the layers of bandage were removed. Alex laughed, and Zoey felt a giggle bubble from her lips. It didn't ruin the mood; if anything, it made it feel better. There was none of the awkwardness that came with a first time with a new partner. None of that pressure to be sexy all the time and perform perfectly. When Zoey was finally naked and Alex kicked off his jeans to join her, it felt like they were a couple that had been doing this for years.
Alex’s hands traced over her new, heavy breasts in wonder, creating tendrils of heat in their wake. Zoey shuddered as her nipples went hard, and Alex took one between his thumb and forefinger to gently squeeze. Lightning forked through her, and she leaned into the touch, silently begging for more.
“You look amazing…” Alex muttered, “Tell me how you want to be touched.”
“I…I don’t know how. I’ve n-never ah!!”
Alex gave her nipple a small tweak, and the ability to speak briefly left her. Alex grinned teasingly.
“You haven’t touched yourself at all since taking the catalyst?”
Zoey shook her head.
“That’s a long time without an orgasm, poor thing, let’s fix that.”
One of Alex’s hands left her chest and moved southwards, slipping down between her legs to cup her new pussy. The heat that had been slowly building there was almost unbearable. Zoey hadn't realised just how much she’d been bottling up her own sex drive. Now that somebody had uncorked that bottle, nothing could hold it back. Alex pressed gently at the mound, squeezing the two lips together and trapping Zoey;s clit between them, making it throb with need.
“Please.” She whimpered.
“Since you asked so nicely…”
His fingers slipped inside her folds, stroking along the silky passage. His finger swirled around that little bundle of nerves, and Zoey could only grip his shoulders tightly and whimper. His other hand was still playing with her tit, sending pleasure sparking through her entire body.
Pressure and pleasure were building at a rapid pace. Every stroke somehow felt better than the last; Zoey knew she couldn’t take much more. Then, Alex’s fingers slipped inside her, and everything was complete. His finger pressed at the sensitive walls of her passage, thrusting up and down as his thumb pressed against her clit. Her orgasm was so fast and strong that it rendered her speechless.
Zoey came silently, with the only sign being the way her whole body tightened and shuddered. Alex pressed his lips to her neck, holding her close and stroking her through it until his touch became so good it almost hurt. When he finally withdrew, Zoey was still seeing stars.
“How was that?” Alex asked with a wry smile.
“Incredible.”
Zoey looked down and saw his erection leaking in front of her. He looked painfully hard.
“Time for me to return the favour.”
Zoey knew this barn inside and out; she quickly found a spare blanket and spread it over the hay before pulling Alex down onto it. He straddled her before leaning down to bring their lips together once more. Zoey let her hands roam, still basking in the afterglow of her first orgasm as a woman. Then, as she felt his cock pressing into her thigh, ready to slip into her she grinned.
“No so quickly there, big fella.”
Using what little muscle she still had, Zoey gripped Alex’s shoulders and switched their positions, rolling him onto his back and straddling his hips. His cock pressed against the front of her wet folds, parting them slightly to rest against her clit. Zoey rose and fell a few times, spreading her wetness over him and making Alex’s pupils dilate.
“Zoey, fuck, I need you.”
I need you.
Those words had taken on a whole new meaning; they made her even happier now. Her own arousal had grown again, and her passage clenched. It felt painfully empty; luckily, she had a way to remedy that. She rose up and then, slowly, began to sink down. Alex’s cock was so much more than a finger. Zoey trembled as it stretched her walls. After what seemed like forever and yet only seconds, she fully engulfed him, and they both paused for a moment to savour the feeling.
Then Alex gripped her hips and gently helped her rise and fall once more. With a moan, Zoey began to ride, her body knew exactly what to do. Up and down, she bounced on Alex’s cock, making her breasts jiggle with each rise and fall. Alex’s hands reached up and gripped them, holding them firmly as she continued to fuck him into the ground.
“Oh, Alex, I don’t think I can hold on!”
She was still so sensitive from her first orgasm, the second built at a rapid pace.
“Go on, I want to feel you cum around my cock.”
That was all it took. Zoey came, squeezing him tightly and milking his cock for all it was worth. Alex squeezed her tits and arched his back before following her. Zoey felt stickiness flood her.
They both moaned, and Zoey leaned down for one last, deep kiss before they pulled apart, curling up naked on the blanket. The chill in the air bothered them not; their skin was still hot.
“So, what are we now?” Zoey asked quietly, tracing circles across Alex’s chest.
“Partners, just like always, but also in a new way. At least, I hope?”
“You have me as long as you want me.”
“Forever then.”
Zoey rested her head against Alex’s heart.
“That sounds good to me.”
~
“And that,” Great Grandma Rose concluded, “Was how I became the very first child born on Titan.”
Sammy wanted a hole to open up beneath her feet and swallow her. Val looked equally embarrassed.
“That was quite the story,” Val said with a tight smile. “Very detailed.”
“Great Grandma, was it really necessary to describe the act?”
“It’s an important part of the story! I found out when I was in my twenties myself. My mother kept a very detailed diary of all things on this ranch.”
“Do those records still exist?”
“Oh yes, do you want them?”
“No!”
Rose just laughed.
“Kids these days, such prudes. I do hope your wedding night is as electric as it was for my parents.”
Sammy blushed; the wedding was tomorrow. The second-hand embarrassment had been so strong she’d nearly forgotten. Val took her hand and gave it a supportive squeeze.
“My point is, this might not be the way you expected to end up, Sammy, but being a woman isn’t so bad. In fact, there are a lot of benefits; the details of that story should be proof enough.”
“I’m well aware of the…benefits of being female, Great Grandma.”
Val turned beet red and got up stiffly.
“I’ll go get us some drinks.”
Rose gave him a wry grin, and Sammy felt her cheeks burn. She loved her great grandma, of course she did, but every time she came to visit, she was reminded how she had no filter. Something told Sammy those drinks would be a while. Rose patted Sammy’s hand gently.
“Seriously, though, darling, you’re alright?”
Her wrinkled face was soft, the cheeky smile replaced with one of love and concern.
“I’m alright.” Sammy nodded. “I spent a while in denial, but I am okay with this now, especially because Val is here. He’s right, you know, so long as we’re together, I don't think it matters which of us is which.”
“That’s right, true love doesn't have boundaries like gender; that’s how it was for my parents. My entire life, they were completely in love.”
Rose got a starry look in her eyes.
“I couldn’t wait to be in love like them, it was all they could do to keep from hugging and kissing at every moment. Growing up with such love in my house, I couldn;t wait to fall myself. Then a few years after my own catalyst I met your great grandfather…”
“Maybe I will go see how Val’s going with the drinks!” Sammy said quickly, getting to her feet and rushing off before Rose could protest. The older woman just chuckled to herself, and Sammy fled the room, red in the face. The last thing she needed to hear was the story of how her grandmother was conceived.
Val was in the kitchen, methodically putting a single ice cube in a glass at a time. Sammy raised an eyebrow, and Val just shrugged.
“Your great-grandmother is…quite the character.” He said, and Sammy just giggled.
“Yeah, that’s one way to put it.”
She stepped close and wrapped her arms around her lover's waist, her breasts pressed to his back, and they both enjoyed a quiet moment.
“With the house full of visiting family, it's hard to get moments like this.”
“Mmmm…”
Sammy snuggled against his back till Val turned himself around to return her embrace.
“We’ll be married soon, then we’ll have this place to ourselves for a while when your parents leave on holiday again.”
“That sounds perfect.”
Sammy placed a kiss on Val’s lips.
She let herself enjoy the kiss; As odd and awkward as hearing those stories from her great-grandmother had been, she was glad to have heard them. It seemed she came from a long line of dramatic romances, and Sammy couldn't wait to see where her’s went.
The End
Comments
Nathan Racher
Yeah... part 3 is already released we need prt 4
ender8343
Part 3 was the July 10 release, post and PDF match the previous part 3
