“Aiden, is it?” Aiden’s head whipped to the door as it knocked, and in walked in his endocrinologist – Dr. Jenny Harmon. Aiden’s back straightened in his chair as he greeted his doctor with a forced smile. His back cracked from having slouched over so much; feeling it was the only way to hide the rest of his breasts behind his hoodie and binder meant his back ached like a bitch. With all luck, though, that would be changing soon.
                   Aiden knew he was trans for as long as he knew what gender was. He had a hunch when he felt comfortable with doubled sports bras as opposed to lacy bralettes, but only when someone accidentally referred to him as ‘he’ for the first time did he know. His parents were not accepting, and going to a religious college meant he had to hide in the college until graduation. Finally, though, he was on his own, with a stable job, a nice apartment, and a hot girlfriend. And the next thing on his checklist was to go on testosterone.
                   “Yeah, uh, hi,” Aiden responded in the best husky voice he could muster. “Nice to meet you, Dr. Harmon.”
                   The doctor returned his greeting with a chuckle. “This might be unorthodox, but please, Jenny is fine. Do I have it correctly you’re starting testosterone today?”
                   Aiden nodded confidently. His heart was racing so fast he almost felt it burst out of his chest. “Yeah. Um, pretty exciting. I’ve been waiting for this for a while. I – I’m also hoping to get top and bottom surgery.”
                   “Fantastic,” Jenny smiled. “So, before we do the shot, I just want to remind you of some of the potential side effects. A lot of trans guys report, well, male puberty symptoms that may be less than pleasant – acne, weight gain, sweat, things like that. Some also report mood swings and bursts of anger.” Aiden nodded like clockwork – he spent the last five years reading the side effects of T, also having spoken to other trans guys.
                   “Right. Yeah. I, uh, know all of this.” Fuck. He was sure hoping T would make him at least a little more confident in his speech. Less ums and likes and whatnot.
                   “And you also know about potential changes in sex drive and sexual preferences?”
                   Aiden chuckled a bit, nervously holding in his breath. “Y-yeah, I do. Thanks for going through all that with me, doc.”
                   He was more than certain, though, that nothing – not even T – would change how much of a needy, subby bottom he was. Whoever his partner was, he was always the bottom. He didn’t have a single toppy bone in him, and he was sure as hell he never would. ‘I mean, me, as a top?’ Aiden laughed to himself. ‘Never. Would never happen ever.’
                   “Great,” Jenny nodded as she grabbed the injection and dose of testosterone. Having a serious fear of giving himself shots, he elected to have his doctor do it for him every month. “Then are you ready?”
                   Aiden grinned wider than he ever felt himself grin. Euphoria took over his body as the injection prepared near his knee. “More than ready.”
~~
                   “…unf… ah… fuck…” Aiden grunted softly as he and his girlfriend went through the motions of sex. His girlfriend laid on top of him, fingering his boyclit roughly. Fortunately, his bottom dysphoria didn’t get too, too much in the way of intimacy. Normally, Alyssa knew exactly how to move her fingers and how to get him real fucking close. But this time, Aiden felt… different. It felt like he was going through the motions. Alyssa was a real fucking hottie, and an excellent top – their kinks went hand in hand and she was quite experienced.
                   But Aiden realized he was feeling something other than arousal. Boredom.
                   “Babe?” Alyssa’s eyes narrowed down at her boyfriend’s confused face. “Is everything okay? You’ve been pretty quiet. How are you feeling? How is this feeling?”
                   Aiden stammered for a bit and then spoke. What was he supposed to say? He didn’t want to hurt Alyssa’s feelings, but… “I-I’m fine, it’s just…” For a moment, he wanted to lie and say dysphoria was just getting the better of him, but he was a terrible liar and Alyssa could always see through him. “This feels… boring.”
                   “Really?” Alyssa blinked. “O-okay. I’m sorry, babe. You want to try something else?”
                   “I…” Aiden gulped. He couldn’t believe what he was just about to say. But thinking about that made his heart race like there was no tomorrow. He needed it.
                   Finally, he spoke. “I want to try topping you.”
                   For a moment, Alyssa’s eyes widened in shock. She was staring at him like he had just grown a second head. Somehow, the surprise made Aiden feel more hot about the idea of topping Alyssa. Then, her face softened and she began laughing. “Come on, puppy. You? A top?”
                   Normally Aiden would have loved the degradation, but right now, the challenge itself was hot. Aiden gritted his teeth. “I’m serious, Alyssa. I want to try topping you.”
                   “Come on then,” Alyssa teased, close to his face. “Fight me for dominance.”
                   Aiden gladly took the opportunity. Adrenaline took over his body as he grabbed his girlfriend and shoved her to the side. Using her momentary shock to his benefit, Aiden crawled on top of her. He stared at her with ravenous eyes, and a greedy grin. Alyssa’s entire face turned beet-red. Aiden would have to be convinced that Alyssa put up a fight at all. Aiden felt blessed that Alyssa was about a 50/50 switch. His hand darted towards the hem of her pants. And then he looked towards her.
                   “Is this okay?” He asked, and could barely wait for the answer.
                   “Y-yes,” Alyssa spoke in a hushed, horny voice.
                   “Good.” Aiden’s hands moved under her pants and he began fingering her. Alyssa seemed unresponsive for a moment as Aiden got used to the motions, and then her back arched suddenly. Good. So he knew what she liked, now. Aiden kept doing that, over and over again, as Alyssa’s eyes lusciously rolled over in her head. Aiden couldn’t believe how fucking hot this felt. He never knew being a top could be so fun.
                   Eventually, with Aiden’s fingers deep inside Alyssa’s cunt, she let out a loud, high-pitched moan as she came.  Aiden could have sworn he came just from the sensation of topping – his boyclit twitched with the dopamine as the sensation washed over him as well. Aiden crawled over to Alyssa’s side and let the endorphins rush past his body.
                   “H-how was that?” Aiden asked, only an ounce of submission returning to his heart.
                   “Um, well, surprising,” Alyssa told the truth. Aiden’s face paled only for a moment as she continued, “but extremely fucking hot.”
                   Aiden chuckled. “Good. That was, uh, well… the hottest thing I’ve ever done,” he admitted as Alyssa laughed again. They clutched each other in their arms, slowly falling asleep as their hearts beat against each other. “So… can we do that again, sometime? Next time, more… negotiated?”
~~
                   A month passed since his first testosterone shot, and he was back in Jenny’s office for his second. Aiden and Jenny made light conversation as she prepared the injection. 
Good. More. Aiden’s eyes focused on the shot, on the vial of testosterone, feeling strangely addicted to it.
        He adored the changes. His voice was already much deeper. His face was now littered with a decent amount of facial hair -- meaning he needed to learn how to shave, finally! And he felt confident for the first time in… wow. He didn’t know how long.
        Not to mention the sexual side effects. Holy shit. Topping Alyssa had become a weekly -- hell, no, a daily thing. He was horny all the time, ready and raring to go. It was a good thing their relationship was open. He was already back on dating apps, looking for needy bottoms and subs. He was getting used to being a top, and now he found himself needing to learn good Domming skills. His life felt completely different. In the best possible way.
                   “So how have the changes been for you so far?” Jenny asked, and Aiden couldn’t help but notice she was eyeing him up and down. “Have you been enjoying the effects?”
                   “Oh yeah,” Aiden responded like lightning. “Yes, very much yes.”
“I bet you’ve recently realized some stuff too,” Jenny jokes.
Aiden’s face froze. Did Jenny know something? “Uh… what do you mean?” He asked, the confidence from his grin fading.
                   “Oh, nothing.” Jenny was clearly lying, but he couldn’t do anything about that. “Some trans guys tend to feel like their preferences change after T, is all. Y’know?”
                   “…Yeah,” Aiden forced himself to nod as Jenny prepared the injection near his knee.
                   As Aiden continued to look at Jenny, he couldn’t help but see her in a different light. The way she bent over showed her cleavage through her shirt just a little, but enough to get Aiden’s heart racing. As his knee got the injection, his eyes glanced down towards Jenny’s curves on her hips. She was plump in all the right places. Aiden clenched his fists into the arms of the seat.
                   God. He could really go for fucking Jenny over the table right about now. He’d have to wait on that, though.
~~
                   “…five… four… three… two… one.”
                   Aiden gasped as he let go of the pull up bar. Pull ups were something he’d been wanting to learn how to do correctly for years. His mom had once said that girls could never do pull ups, and he felt himself gag. Now that his body was stuffed with testosterone, he could do them with ease.
And he admired just how much his muscles had grown! He always loved working out, but one of his biggest lamentations was being unable to build a ton of muscle. Now he had biceps that bulged when he flexed and legs that could run a marathon like it would be nothing. Nowadays, aside from being in bed on top of a hot chick, the gym was his favorite spot. All of his gym bros were always supportive of his trans identity, even the cis guys who were more muscle than skin.
The door opened, and a new girl walked in. Aiden’s heart immediately pounded, going through the motions. He looked at her like she was prey. And to be fair, she probably was. Aiden tried not to stare as she signed up for the gym, paid the membership fee, and began trying – and failing – to do push ups on the yoga mat.
There was Aiden’s opening.
“Hey there,” Aiden said casually, walking over to her. “First time here?”
The meek, mousy girl squeaked as she looked up at Aiden. Aiden wasn’t tall but he still towered over her in a sense. He loved that his newfound dominance made up for his short height. “Um, yeah,” she whispered. “I’ve been wanting to build muscle for a while, but… I’m not sure where to start.”
“Well, push ups on the ground are pretty hard to start with,” Aiden explained. He dropped to the floor to demonstrate how he did them. “You have to keep your entire back straight, which can be hard if you don’t have much arm strength. Maybe you should try knee push ups first?”
He got into the pose to demonstrate, and the girl followed suit. “L-like this?” she asked.
“Yeah, like that!” Aiden grinned. He went through showing her how to do that, intending to show her... a few other things. “If you do those a few times a week, you can slowly move up to incline push ups, and then to the ones on the ground. You’ll get there!”
The girl giggled, feeling a lot more at ease around Aiden. Huh, Aiden thought, maybe I should go ahead and look into my personal trainer certificate. “My name’s Aiden. Yours?”
“Um, Daisy. Thanks for showing me, Aiden. Can you, um…” Her eyes glanced towards the weights. “S-show me some basic dumbbell workouts next?”
Aiden grinned even wider. This was going amazingly. “Of course. It’d be my pleasure.”
 Aiden all but dragged the girl over to the benches, showing her a variety of basic exercises. He started with 5-pound dumbbells, figuring she couldn't handle much more than that. Daisy lifted the dumbbells into a bicep curl, struggling for a bit, and Aiden cheered her on. He loved this. He loved the feeling of training someone else to exercise -- it was a different feeling of control he didn't exactly get from being a Dom top.
                   Or could he?
Daisy finished the set, and Aiden showed her a few other exercises. The more she'd work out, the hornier he got, and the more his hands found their way onto her body. No one in the gym seemed to care, and more importantly, Daisy seemed quite flustered and hot. Good. Aiden loved every second of this.
About 30 minutes passed, and Daisy was about at her limit. She got her things together and made her way to the bathroom.
                   "I, uh, should probably shower," she grinned sheepishly. "Um... do you want to--"
                   "Yes," Aiden interrupted and dragged her into the private shower. Luckily, this was a small gym, so they didn't have a public shower room with stalls.
                   As soon as Aiden and Daisy knew they were alone, they did a brief negotiation. Daisy had less than no problem with Aiden being trans, which got the last of Aiden's anxieties out of the way. Within seconds of finding out Aiden was a Dom top, she began throwing her clothes off onto the ground. To muffle the sounds, Aiden turned the shower on.
                   "Don't worry," he grinned. "No one will hear you scream... probably."
                   Aiden's fingers made quick work of Daisy's body, fondling her tits and waist possessively. Her body was so petite and all he could think about was the various ways he could break it with his strap on. Daisy's moans filled the room as Aiden got her wet and needy, fingering her clit ruthlessly. Her body felt like it was melting onto Aiden's.
                   "Do you like this, slut?" Aiden whispered into her ear. "Do you like me using your body like it's my toy?"
                   "Yes, yes, yes," Daisy gasped in response.
                   "Wonderful," he grinned onto her skin. "I think we're going to have a lot of fun, me training your body and then using you in the shower after every run. Sound fun to you?"
                   Daisy didn't answer with anything but needy moans, which probably meant a yes. "Good," Aiden said. "Get on your hands and knees."
                   Daisy obeyed.
                   "I think you know what to do next."
                   She did. She obediently took Aiden's strap into her mouth, worshipping it like a real cock. Aiden turned on the vibrator in the strap on, feeling himself get wetter and wetter. "Oh, fuck," he moaned, having to sit down on the stool. "That's real good, babe. Just go as deep as you can. The view from up here is gorgeous."
                   Daisy giggled around Aiden's cock. Then, she paused and pulled out. "I-I..."
                   Aiden raised an eyebrow. "Something wrong, dear?"
                   "My... cunt..." She stood up and offered it up. "Please fill me up, I'm so wet..."
                   Aiden grinned wickedly as he grabbed Daisy's hips and pulled her onto his cock, pushing it into her. "That's right, babe. Let me use all of your holes. All of them."
                Aiden banged his hips into her, uncaring as to who could hear, how loud they were being, or how well Daisy could take it. He fucked her in a hundred different poses from a thousand different angles. Aiden could feel Daisy cum around his strap-on at least five different times. He wouldn’t stop, he couldn’t stop until he got his fair share as well. Their pants and moans filled the shower, echoing off the walls as the scent of sex and arousal surrounded them.
                With a last few thrusts, Aiden finished as well, his boyclit going wild as he continued wrecking Daisy’s cunt. He felt the thrill of topping rush through his body as he shivered with sheer pleasure. As he came, he kissed Daisy’s neck hard, giving her three hickies while he rode out his orgasm.
                Afterwards, they laid in the shower together, making out as the water washed off the sweat and sex on both of them. Aiden grinned down at Daisy, who all but looked ready for a round two already.
                “So, let’s do this again sometime, huh?” he offered.
                Daisy giggled. “Y-yes, please.”
                “Great,” he slapped her ass as he stepped out and got his clothes back on. “See you at the gym at 6am tomorrow, pretty tits.”
~~
                It didn’t take long for Aiden to introduce Daisy and Alyssa to each other. And it didn’t take long for Aiden to top both of them at the same time. One Saturday morning, after some hot kinky morning sex, Aiden checked the mailbox for anything interesting. Sure enough, it was bills, spam, or a letter from the hospital.
                Wait.
                Aiden rushed back into the house, sitting down next to Alyssa and Daisy sharing tea together as he ripped open the letter with a fervor. This was from his insurance. That could mean—
                “Holy shit,” he exhaled as he read the letter carefully. He couldn’t believe it.
                “What?” Daisy asked, turning to him with a bit of concern. “What happened?”
                “My insurance approved me for top surgery!” he exclaimed with nothing but happiness, jumping out of his seat. “I can’t believe it! Holy shit, I just… fuck!” A smile was permanently plastered on his face. “This is the best fucking thing that has ever happened to me!”
                Alyssa and Daisy both wrapped him in a tight, supportive hug. “That’s so awesome!” Alyssa said, nuzzling her head into his neck. “I’m so happy for you, babe!”
                “You’re gonna yeet those teets,” Daisy joked as she rubbed a hand down his arm.
                “Hell yeah I am,” Aiden laughed boisterously. “Holy shit. I’m so fucking pumped, girls.”
                Alyssa put her hand on his lap, dangerously close to his strap on. Daisy did the same. “Are you, babe?”
                Aiden didn’t have a real dick quite yet, but he felt exactly like he just got an erection. “Yeah,” Aiden grinned, eyeing both of his subs hungrily. “In fact, I think I need to burn some of this energy. You ready for another round?”
                Of course Daisy and Alyssa were both willing and ready to get topped by their hot boyfriend again. They got on their knees as Aiden pulled down his pants, pushing both of their heads into his crotch. He turned the vibrator on as they sucked obediently.
~~
                Aiden sat in Jenny’s office, his leg bouncing with excitement. It was the last testosterone shot he was going to get before top surgery. The changes he experienced were everything he imagined, and more. His jawline jotted out nice and sharp, with the edges being quite defined. He had a generous amount of facial hair, and he soon realized that he’d get a burst of gender euphoria every time he needed to shave. His muscles were toned, defined, and he donned a six pack whenever he went out in a crop top.
                Not to mention, his sex drive was off the charts. He felt so masculine whenever he had sex, whenever he topped. He dripped with adrenaline and dopamine when he came. He smelled like sex at almost all times. And he loved the fact girls crowded around him, desperate for a turn – and some folks of other genders. He had to clean his strap-ons twice a day.
                Jenny walked in, already preparing the testosterone shot. If Aiden was being honest, he could probably give himself the shots at this point. He only really came for Jenny. To admire her curves, and try to make a move. His doctor looked like she had such fuckable hips. It drove him crazy.
                “Excited for your top surgery, Aiden?” Jenny asked, making what seemed like genuine conversation.
                “Hell yeah I am,” Aiden asserted. “I’ve been wanting this all my life. I can barely sleep.” He almost called Jenny babe, but held himself back.
                Jenny giggled, then said something quite unexpected.
                “Though with all the testosterone I’ve been giving you, I’d be quite surprised if you weren’t a top already.”
                Aiden choked.
                What did she just say?
                “I… you… huh?” He paused, blinking. “You… how did you…”
                Jenny chuckled again, preparing to inject the shot right into Aiden’s knee. He tried to still himself, but not for the shot itself. More to figure out what the hell Jenny meant.
                “I said at the beginning, lots of trans guys find their… sexual preferences changing,” she explained coyly. “I could tell it when I first saw you. That you were a complete bottom, and that would be changing very, very quickly. How does it feel to be the top Dom in residence?”
                Her voice was almost mocking. It made Aiden so angry, and so hot. More than ever, he wanted to bend Jenny over the medical chair and fuck her mercilessly. But he couldn’t. He sat there, frozen, his jaw on the ground. How did Jenny know? Did Jenny know this whole time? Aiden wasn’t really that obvious, was he?
                “How did you know?” he asked bluntly.
                “Please, I’m a huge bottom myself.” Aiden had to wonder how many medical ethics rules Jenny broke with that sentence alone. “I can tell a good bottom when I see one.”
                “You can? How can you do that?”
                “You keysmashed to me in one of your patient portal messages one time.”
                Aiden rolled his eyes upwards. Of course he did pre-testosterone. “Okay. That’s fair. But… how did you know testosterone would turn me into a top?”
                Jenny kept him waiting, smiling deviously.
                “Scratch that,” Aiden said. “Give me the shot and answer my question, cutie.”
                Jenny smiled as she slowly gave the injection. Aiden felt his muscles convulse. He was so fucking horny. It would take all his willpower to stop himself from fucking Jenny, and that’d be if the conversation ended there. Fortunately for both of them, it didn’t. Aiden glared at her with the look, the Dommey look he’d give all of his prospective subs. He wanted this. And he knew she wanted this too.
                “Because,” Jenny said as soon as the testosterone was in his body. “You had a certain energy. You were meant to be a top, Aiden. And…”
                She pulled her pants down, bending over and revealing she wasn’t wearing any panties. Aiden swore he blacked out and he was now in heaven. “Because I’ve wanted you to fuck me this whole time.”
                Aiden let loose. He couldn’t control himself. He threw his pants down and took a few seconds to aim his strap-on into Jenny’s asshole. He grabbed some spare lube from his pocket – he learned to carry it around at this point – and slathered it on the strap. Would he be kicked out of the hospital for this? Would Jenny lose her license? Who knew. He sure didn’t care. All he cared about was fucking Jenny’s ass hard and rough.
                Within seconds, Jenny was panting and moaning into the patient bed. “Fuck, yes, just like that!” she cackled. “I-I fucking knew you were a top, Aiden. And I’m so—ah!”
                Aiden thrusted particularly hard into Jenny’s cunt. “Don’t worry, dear,” Aiden’s breath trailed down Jenny’s spine. “You don’t have to say anything. All you have to do is pant and moan like a bitch. Like my bitch.” The vibrations from the strap went down both of their sexes, making the doctor and patient go haywire. They could barely speak. All they could do was fuck.
                He was in control. He was a top. He didn’t care about anything other than topping girls and being a cocky Dom. Jenny was just another one of his playthings. Aiden didn’t even really register the fact Jenny might have intentionally made him a top for just this purpose – but it didn’t matter. Right now, what mattered was how close both of them were to orgasm.
                Aiden spanked Jenny once. And then multiple times. Soon enough, Jenny’s ass was bruised. Aiden loved looking at Jenny’s bare, blue and red ass. All that time in the gym meant Aiden gave fantastic spanks.
                “I’m – I’m going to cum, Aiden—” Jenny started, but then Aiden shoved his fingers into her mouth. He used his other hand to pleasure her sex, stroking it up and down without mercy.
                “I didn’t say you could cum, cunt,” Aiden growled. “Why don’t you let the men in charge finish first?”
                Jenny nodded. Of course she would obey him. She was a bottom, and Aiden was the top. Aiden was in charge. And as he thought about how much people obeyed him, how many people he could use for his pleasure, he thrusted in hard and came. It almost felt like he was breeding Jenny’s asshole. God, he wished he could actually cum semen. But that was only a minor inconvenience. He might as well have, with how much Jenny’s body shivered.
                And then Jenny took that as permission and came herself, cum dripping out of her cock as she melted into the surface.
                Both of them were exhausted. Aiden felt all the anger he may have felt drifting away as his body melted as well. He pulled out, getting his pants back on as Jenny reoriented herself too.
                “I can’t be mad at you, babe,” Aiden grinned. “After all, I’m much, much happier this way.”
                Jenny turned behind her and grinned. “And the changes will only get hotter from here, mister.”
~~
                Two and a half years passed. Not only did Aiden’s top surgery go extremely well, he was also approved for bottom surgery a year later. Bottom surgery was much harder to get used to, but after about six months, he was back on his feet and ready to fuck any hot girl in sight.
                He still needed his testosterone shots, though. But today he was going to Jenny’s office for another reason. As he strolled through the door confidently to greet Jenny, the meek doctor whipped around.          
                “Aiden?” she blinked, stammering. “I—Hi! Um, your shot isn’t due for another week, so—”
                “Oh, I’m not here for that,” Aiden said as he forcefully bent her over, ready to go with his new dick. “I have other plans. I’m going to breed your ass.”
                “B-but that’s impossible,” Jenny gasped, even though she didn’t protest to Aiden’s dick going inside her again. “I’m trans, and you can’t ejaculate semen!”
                “Don’t worry,” Aiden grinned. “Doesn’t mean we can’t try.”