Chapter Text
Donnie's eyes flickered back and forth over his workdesk, taking in all the scattered parts and unfinished pieces of his latest project. But no matter how hard he tried, how long he sat, his brain just wouldn't focus. He could see all the pieces he had, all the steps he had to take, but his mind just wouldn't compute it, wouldn't take in the information and get his body to do something useful with it.
He'd been at this for a few hours now, head spinning with ideas and plans, but seemingly unwilling to actually get anything done. And he was tired of it.
And what was worse is that he knew what was wrong with him! He knew what he could do to get himself back in top working order.
He was pent up.
See, his beloved and brother Leonardo had been a bit down recently. Now, why he was feeling that way was lost on Donnie, as whenever he went to ask about it, Leo just brushed him off, grumbling that he was just having an off day.
The problem was, he'd been having an off day every day for about 3 weeks straight, and not only was Donnie worried, but on top of that, he was horny.
This combination led to stress. Stress about not being able to work, stress about not knowing how to help his lover, but upon all of it, fear it was his fault for Leo's emotional disturbance.
Have I done something? He would ponder in his lab at night, Did I say something? I can be a bit… blunt, sometimes, but surely Leo would just come to me if that were the case?
It kept him up at night, made him short-tempered and snippy toward anyone who wasn't Leo, and he could already tell it was building tension among the family. He was horny, worried, and stressed, three things only worsened by the fact Leo hadn't been in the mood the entire time he'd felt down.
Now, Donnie would never blame Leo for something like that. He would never get angry or annoyed at Leo. Because, as concerning as it may be, Leo has a right to feel whatever sadness or anger he is at the moment. He has a right to tell Donnie no whenever he so chooses, and Donnie would sooner die than pressure Leo into having sex when he didn't want to.
…
But…
But he's so horny.
And not even in the funny way. Or the sexy "If I don't have you right now, I might just die~" kind of way.
No, it just had to be the, "If I don't fuck something soon I'll actually scream." Kind of way, and it's driving him nuts.
His sexual advances had been brushed off or ignored multiple times that day, and Donnie respected every one, but god dammit he might just cry. And he's tried jacking off, but the sensation of touching his own cock just isn't sitting right with him, his nerves grating unpleasantly whenever he reaches for himself.
So, as he gets up and starts heading towards Leo's room again, already bracing himself for another less than polite rejection he probably deserves, he groans softly to himself. All that was left to do was to go crawling back to Leo, like the pathetic Nardo-addict he was.
But the scene that greets him is more than enough to stamp out his arousal, at least for the time being.
See, Leo's always been a bit… off, about his appearance. Donnie knows that better than anyone, though maybe not the exact reason.
Being trans has never really been an issue in public or around people, since his strength and muscles have always indicated the body type of a young growing man, but… Sometimes Leo can't help but see femininity where no one else would.
His hips are always just a bit too wide in his eyes, his waist a little too small and his arms a bit too skinny, despite being sculpted and firm with muscle. His eyes are a little too big, his lashes a little too long, his chest a bit too protruding, despite the fact any and all of those traits are almost the exact same as Donnie's.
He insists, on his worst days, that Donnie just doesn't have those things, that his body is masculine, and that Leo's is just- inherently feminine, and he hates it.
And, while Donnie doesn't know all of that, or how deep the hatred goes, he's not an idiot. Nor is he blind.
So when he walks into Leo's room to find his mirror shattered all over the ground, and Leo curled up in his bed, sobbing with a bleeding arm, Donnie gets a distinct feeling it's not just because he was angry.
He immediately reaches for the medkit in Leo's bedside drawer, being careful not to step in any glass. He pulls it out, and crawls onto the bed beside Leo, gently smoothing his thumb over the Slider's cheek to wipe away some of the tears. They continue to fall, and Leo only burrows further into his blankets, but Donnie knows he'll be ready to talk once he's calmed down a little more.
He gently takes Leo's injured arm, keeping his movements slow and calculated. Calm, if only for Leo's sake. Security has always been what Leo needed in these moments, even before they'd gotten together. When the world would get too much, when the texture of his gloves would grate on his nerves like barbed wire, when his emotions just didn't have enough room to be expressed individually.
Having a somewhat absent father, and an older brother trying to take his place, has led to a need for security. For almost babying reassurance. Soft voices and kind encouragement, assurances that it'll turn out okay, that he's doing all he can, and no one expects more from him.
And while it's never gotten this severe before, the Softshell knows this situation isn't any different under the surface.
So, he takes care of Leo, like he always has.
He gently takes some tweezers, pulling out all the shards of glass still stuck in his wounds. He hushes and soothes away every grimace and hiss and wince of pain with a kiss and a soft, comforting churr. He wipes away the blood, disinfecting the wound as gently, yet efficiently, as he can.
He rambles out loud to distract his distraught twin, first about his current project, and then about his newest update to their shared game console. (A Genius-Built console, able to access and run any game originally meant for any popular console. A marvel for certain, not to brag or anything-) And finally, once he's finished cleaning and wrapping the injuries, he coos and chirps reassuringly until the Slider has cooled down enough to lift the injured arm, silently giving Donnie permission to move from verbal comfort into physical.
The Softshell takes the invitation without hesitation, sliding into the offered space and lifting his left leg until it's resting comfortably on Leo's hip, foot curled near his tail. He wraps his arms under Leo's own, nuzzling into his neck, and then churrs deeply, the sound vibrating in his throat and sending a shiver through the Slider's body.
Almost immediately, the remaining tension deflates from Leo's muscles, his body slumping and relaxing into Donnie's embrace.
"There we go…" Donnie whispers, "That's it, love, just breathe and relax for me…"
Before this relationship, Donnie would admit, words of affirmation and comfort had never been his thing. And in a way, they still weren't, but Leo had become the exception.
After seeing how well he responded to soothing words and gentle encouragements, courtesy of their lovable big brother, he morphed his behavior during Leo's worst moments to include them.
The difference was both exponential and undeniable. Leo would cool down so much quicker, would be more willing to discuss the issue at fault, would end up far more cuddly than not. He would accept help so much easier, would smile more afterwards.
Donnie loves his smile.
When Leo's already down, his brain likes to push him even further into the metaphorical corner than he already is, pushing entirely unfounded doubt and fears onto him until he just refuses help altogether. This would make nightmares and breakdowns that much more difficult to handle.
Now that Donnie knows this, however, he can actually do things about it.
Words of affirmation are undoubtedly Leo's love language, and Donnie takes full advantage. Whispering soft encouragement and praises into his ear as he comes down from a panic attack, or a breakdown.
Donnie has learned, and the best part? He feels useful.
While in the beginning, when they were first entering their relationship, working out how to move around one another in this new realm of closeness, Donnie always felt… useless. At least when Leo was vulnerable, needing comfort but unwilling to ask for it. It almost made Donnie angry, wanting to help, but unable to when the Slider just… refused to tell him how.
Now though, cuddled against Leo and soothingly rubbing circles into his shell, he's never felt so important. So necessary. Needed.
And sure, that might not be a good thing, codependency and overt reliance on one another couldn't be all that great in the long run, but it always made them both feel so secure. And it brought them together even closer, made their bond even stronger than before.
After a while, Leo finally sighed heavily, eyes cracking open to meet Donnie's concerned ones.
"Hey…" He whispered, eyes crinkling a little around the edges.
"Hello." Donnie replied, cracking a small smile of his own.
They sit in silence for a few more minutes, just looking into each other's eyes, feeling the weight of their current situation.
Until, about 5 minutes later, Leo finally breaks eye contact, hiding his face in Donnie's neck and sobbing softly. Donnie doesn't mind, simply hushing and cooing at him through his tears, pressing soft kisses to his neck and head lovingly.
"What's wrong, love?" He asks softly, rubbing Leo's shell in soothing circles.
Leo says nothing for a little longer, before whispering in the most heartbreaking way Donnie's ever heard.
"I… I feel like a girl…" He whimpers softly, "I-I don't… I don't feel strong or manly enough, I feel f-fragile and tiny and so fucking-"
He cuts himself off, but Donnie gets the idea.
Suddenly, Leo's recent behavior and mood start to make more sense.
The huffy, saddened attitude, the almost disturbing quiet, the extended periods of time he would spend alone in his room. The smashed mirror.
Donnie feels like an idiot for not taking that option into consideration before it got to this point, but, at the same time… how could he have known?
It's Leo's thing to be secretive about his insecurities. To bury them all under so many layers of cocky smiles and almost narcissistic admiration for himself, that not even he could remember they existed in the first place.
Whether he meant to or not, he actively hid this part of himself from every person who loved him. And isolated himself in the process.
"You are not a woman, Leo." He snaps, the frustration with both Leo's dysphoria and his own ignorance finally boiling over. "You are not. You are my brother, and the hottest guy I've ever had the privilege of fucking in my life."
His grip on Leo tightened, and his breaths started coming faster and huffier in his anger.
"I don't care if you have a vagina or a penis." He growls, some of that arousal from earlier flaring up again in response to his emotion. "If you're a six foot muscle wrestler or a five foot scrawny mess."
The air between them is starting to stink of Donnie's scent, of his want for Leo. Of his need to show Leo how little he really cares what genitals he has. "You're my brother, the love of my life, and more manly than any man I've come across."
Leo seemed to be responding well to his almost aggressive assurances, to his scent, because now his own was blooming around them as well. He didn't protest whatsoever when Donnie started roughly nipping up and down the length of his neck. He even began wetly churring and nuzzling into it.
"You have no right insulting my boyfriend like that, of disregarding all the work, the sheer hell he's gone through just to accept who he is. And I refuse to let you undo all his extraordinary progress."
Suddenly, he pauses, pulling away slightly and taking in his twin's flushed face with a sheepish grin.
"If you want that, of course…"
Leo looks like he's about to enthusiastically agree, to plead for Donnie to take him and show him how manly he thinks he is, but… He stops short. His eyes start welling up in tears, and he shakes his head, a small, pathetic hiccup welling in his throat.
Donnie immediately thinks he's said something wrong, Maybe the assertive, angry approach was too much? And tries to backtrack.
"Hey, hey, it's okay, it's okay. It's gonna be okay, you don't have to do this, Leo. You don't have to do anything-" But Leo shakes his head again harshly, groaning and bringing his injured hand up to claw at his own face in frustration. The Softshell puts an end to that before it can even start, however, gripping the bandaged arm firmly, yet gently, and pulling it away. The Slider's legs kick instead, but Donnie concludes that that's much better than the harmful alternative.
"I-I- That's the problem!" He suddenly snaps, "I-I want to, but it feels so f-fucking wrong to be touched down there!" Donnie comes closer, trying to provide comfort while not crowding his twin, along with trying to not get kicked in the shins if he can help it. Not that he gives a shit. "I-it feels like torture whenever I-I get wet, o-or when anything is pushed inside me, b-because-"
"Because it reminds you…" Donnie realizes all at once, and suddenly every sexual encounter they've ever had comes back to him full force. "Oh Leo, I… I'm so sorry…" He whispers, pressing kiss after kiss to Leo's face, internally sighing in relief when the kicking dies down a little.
"Y-you…" Leo starts, voice soft and scratchy from disuse. Donnie would have to make him some honey tea later. "You have nothing to apologize for…" He clings to Donnie, tears starting to roll down his face silently. "I-it's my fucked up brain, not… not yours…"
The Softshell just shushes him soothingly, holding him close.
Even as he comforts Leo, hundreds of ideas are swarming his head, as they tend to do when he's faced with a problem. He can't fix Leo's dysphoria, it would've been gone by now if he could, but… But he can offset it with gender euphoria.
Now, that was an idea worth thinking about, but how…
He had dozens of little snippets of ideas he could build into full ones, but they all involved inventions and at least a day's worth of work and precise tools to put together… all but one.
"What if… what if we didn't put anything inside you?" He asked softly.
"It's not just when things are inside me, it… it's also when anything touches me down there…" He replies, voice equally soft with sorrow.
Donnie shakes his head, before silently taking Leo's uninjured hand and bringing it down to his own crotch, still very much hard and bulging in his pants.
"Not like that either." He states firmly. "What if… what if you pretended my penis was yours?" He asks, almost hopeful, though he keeps that part subtle, just in case Leo didn't like the idea. He didn't want to unintentionally pressure him.
The Slider looks shocked for a second, and then doubtful, before his face settles on something between uncertain and hopeful. Better than what it was before…
"I…" He starts softly, eyes drifting between Donnie's crotch and his face. "Yeah… yeah, we can try that…"
The Softshell smiles wide, pulling Leo close and peppering his face with even more kisses.
"Wonderful! And, if it doesn't work how we want it to, I have dozens of other ideas ready for trial, whenever you're ready." He says giddily, prompting Leo to scoff and roll his eyes playfully, lightly shoving Donnie's shoulder.
"Of course you do. You learned about this 3 minutes ago, and you're already formulating action plans." He smirks, shaking his head.
"Well," Donnie shrugs, a smirk of his own playing on his lips as he gets up to undress. "I am the brains of this relationship, love. It's my job."
He chuckles and expertly dodges the pillow tossed his way, not even glancing back when Leo snaps 'Hey!' In indignation.
He only turns back when he's fully naked, raising his arms and displaying his body for a blushing Leo to gaze upon adoringly. The trouble comes when he moves to help Leo discard his own shorts, as the Slider instinctually flinches and crosses his legs in shame.
"C'mon, love…" He encourages softly, "We won't know until we try, and I know it's hard, incredibly hard, but you wouldn't be the Leo I know if you weren't all about choosing the hard way."
Leo smiles softly at that, recognizing the ploy for what it is.
If soft encouragements weren't enough, then a challenge surely was. And it was, as it turns out, because after another moment of hesitation, he squeezes his eyes shut and extends his legs, finally allowing Donnie to pull the shorts off of him.
"There's a good boy…" The Softshell praises, only half teasingly.
Meanwhile, Leo's face burns.
"You like when I tell you how good of a boy you're being, don't you, love?" Donnie continues, climbing onto the bed and pulling Leo into his lap, shell to plastron. Leo nods hesitantly, cheeks still practically glowing with both embarrassment and arousal at Donnie's sultry words.
"That's good, baby," The Softshell whispers into Leo's ear, pulling his own tail forward and palming it roughly. His eyes fluttered shut, and he softly groaned into Leo's neck, letting his tongue push out and lave over the skin gently. "Because you are my good boy, the perfect boy for me…"
Leo whimpers softly, and actually stiffens when Donnie's cock starts to peek out and brush his gradually slickening folds. He squirms in discomfort, the sensation making that unpleasant dread flare up again.
"Shhh, it's okay, love…" Donnie sighs gently, pressing soft kisses against the lip of Leo's shell. "Just pretend you're dropping, baby boy, okay? You're dropping, and I get slick whenever I drop too, y'know?"
He reluctantly pulls his hand away and shows Leo the slickness that's accumulated so far, to ease the slide of his cock. "See? Your body's just slickening itself so your cock can slide out, I promise…" He brings his hand back down, and coaxes his cock further out, groaning when it slides against Leo's folds.
He's never seen Leo as lesser for not having the same genitals he does. It's never made comprehending or understanding that he's a man hard, that's just… how it was. Regardless of what was held concealed in his black booty shorts, he was his boyfriend, and the prettiest boy he'd ever seen.
He smiles in satisfaction and relief when Leo's body relaxes a little at his words, nodding his head and keeping his eyes shut, trying to imagine what it would feel like to have a hard, thick organ trapped inside his plastron. To feel the relief it brought when it was finally released and allowed to swell to its full height. He whimpered softly, though in pleasure this time, when the cock started dropping fully, using his imagination to make up for the lack of feeling in his fabricated cock.
"There, see? That's it, love, you're doing so well dropping for me. Such a good boy…" Donnie encourages softly, holding back any of his own pleasured sounds to make the situation more immersive for his twin. "You see how wet it is? How much slick it needs to push out like this?"
He gently grips Leo's chin with his free hand, tipping his head down to show him. "Your cock is so big, it needs all that wetness to even push out of you, see? Your slit is just a pocket to hold it..."
He hears the gasp Leo lets out at the sight, watching how Donnie's- no, his cock slides out. How wet it is, how heavy and thick it feels pressed in between the lips of his slit. It feels so good, so right, and he can feel the earlier pricklings of frustration and wrongness in his head fading with frightening swiftness.
"I-I-" He stammers a little, jolting when his clit rubs against the cock holding the lips of his slit open. It's unpleasant, the reminder that the cock really isn't his, but the visual it creates is more than enough to offset that. "Yeah- yeah, it… fuck…"
Donnie smirks a little, before bringing Leo's uninjured hand to wrap around the shaft, gently urging him to stroke it. "There we go, love, jerk off for me. Be a good boy and show me how you pleasure your pretty cock~" He whispers, guiding Leo's hand to slide up and down the shaft.
Leo whines and starts to do just that, squeezing and twisting and sliding his hand up and down the length of it, watching with rapt attention as it twitches and jerks with each movement. He… he can almost feel how good it is, what it's like to feel every twitch and jerk for himself. He could feel how his cock seemed to beg for more friction, more touch, and without even realizing it, he started just barely rocking against it, matching the pace of his hand.
The result was euphoric, the feeling of his clit matching the cock just added to how realistic it felt, how real this scenario felt, and he started moaning softly, continuing to stroke and twist his hand slowly.
He couldn't hump very fast from this position, but he didn't care. It wasn't the pleasure, or the release he was chasing. Only the rightness he felt when he watched his hand slide up and caress the tip of his cock, when he humped his hips forward slightly to match. He couldn't take his eyes off of it, off of the twitching, jerking cock as he neared his climax.
"That's it, baby, that's it. That's my good boy, tell me you're my good boy, baby." Donnie ordered, voice a little breathless. But Leo didn't care what Donnie sounded like, he was too hung up on the words good boy to give a shit about anything else.
"I-I'm your good boy," The Slider gasped and shuddered, slowly approaching his orgasm. "I'm a g-good boy for you, 'm a good boy…" His words were starting to slur together a little, and his humps were starting to lose rhythm. The pet name, the word boy on Donnie's lips made his hips stutter, setting off bursts of happy hormones in his brain.
"That's right, baby boy, that's right. You ready to cum? You ready to shoot your hot cum all over the sheets for me?" Donnie asked seductively, reaching his own hand back to lightly scratch and harshly rub against his soft shell, feeling the pulse of his own orgasm just around the corner.
If he timed this right, Leo would get to see himself cum, would get to live the fantasy to its fullest potential. Donnie was determined to give that to him, at least until he put together his more permanent solution, of course.
The Slider nodded frantically, eyes fluttering as the pulsing inside him began, only doubling the euphoria he felt when his cock pulsed at the same time. He was close, and just like Donnie said, he was gonna shoot his load in front of him. He was gonna paint the sheets white like he'd always wanted to.
"Yes!" He pleaded softly, more needy than he'd ever sounded before. "Yes, please- wanna cum, please, please let me cum, Donnie-" and with those words, Donnie gripped the back of his head and forced him to look down, before biting into the flesh of the Slider's neck roughly, sending him over the edge.
And with one last scratch to his own shell, the Softshell came as well, his groan muffled by the bite as he shot his load all over the bed in front of him, thick ropes of hot white liquid spurting from his cock messily.
And oh, Leo's face, his sounds, they were priceless. Fucking perfect. He sounded more pleasured and thoroughly overwhelmed by euphoria than he ever had before, shaking and jerking slightly, eyes struggling to stay open to watch as he came all over the sheets. And it lasted, his orgasm holding and jerking through him so much longer than any other he's ever had before.
The thing in Donnie's brain, the one that always nagged and clawed at him to please his mates, was singing and crooning and sighing in delight, making him feel complete and whole for the first time since Leo's distress had begun. And as they slowly came down, as the Softshell's mind slowly came back to him and Leo's shaking started to abate, he pressed soft kisses against the fresh bite mark.
"You did so good, baby," He whispered lovingly, soothingly gentle against the Slider's skin. "You were such a good boy, jacking off for me, shooting your load like that…"
Then, both of them stayed silent for a while, just catching their breaths, kissing gently when Leo finally turned around in Donnie's lap. Tongues intertwining and soft whimpers being exchanged, gentle face caresses and tapping to each other's temples. It was perfect.
And the best part?
The good feeling never stopped.
The soft hum of euphoria under Leo's skin never left, continuing to simmer and beat with his heart, long after he came down and Donnie's cock slid back to where it belonged. He'd never felt so good before, so right, and he actually started to cry into their kisses from sheer relief.
After so long feeling horrible, feeling like the biggest fraud and worst liar to ever exist… feeling so alone and wrong and tired…
He felt… good. And right. And perfect.
This is what it's supposed to be. What he felt then is what he was supposed to feel. And that confirmation alone had his head reeling in relaxing, happy chemicals he didn't think he'd feel ever again.
"You're so relaxed, love…" Donnie finally states, having put his gauntlet back on so he could type in his plans for the more effective solution he had in the works. "I'm assuming it helped?"
Leo nodded slowly, feeling his eyes start to drift shut, his head resting against Donnie's chest exhaustedly.
"Yeah…" He sighed almost dreamily, letting his eyes slip closed in relief, relaxing and churring softly when a kiss is pressed to the top of his head.
"I'm grateful, love. Now, sleep well. I'll have a surprise for you in the morning."
And with that, Leo is out like a light, mind finally given the rest it'd been craving for so long.
And Donnie, well… he had plans to keep it that way.