Work Text:
Leo had once again invited himself to his lab during one of his work sessions, a common occurance, much to the genius' irritation.
...And appreciation. People never saw how clever he was. Sure, Leo wouldn't stand a chance in a trivia battle of any kind, but he was excellent at solving puzzles and problems.
Each time he broke through lab's security Donnie had the task of detective to figure out how he had done it and try to fix it. No matter how many instances, Leo still found a way in without tripping any security measures.
And he had made Donnie aware of his presence by leaning against the back of his chair and touching his shoulder casually.
Each touch, however casual or innocent, just sent electricity down his shell and he often pondered what it would feel like with more prolonged touch in other places.
However, in the moment he shot him an annoyed look, which only made Leo laugh.
Stupid twin and his stupid, dumb laugh that made butterflies in his stomach.
The slider stopped hanging off his chair and stood up, his hand dramatically on his hip.
Those damn hips attached to that tiny waist and sleek thighs-- *Get it together, Donatello.*
"Awe! Come on, Donnie baby, admit it, you love seeing me around! Besides, you hole yourself up in this place anymore and you'll be a hermit." Leo used a teasing and lighthearted tone, but Donnie flinched at the nickname.
The slider used it as a flippantly as possible the first time he called him that, but unfortunately for the softshell, his annoying twin noticed and assumed he was uncomfortable and had been playing with him with it ever since.
Unknowing to Leo, Donnie loved the nickname. Maybe a smidge too much.
Too much as in he had a few recordings of him saying that over and over again and used it as an aid to provide himself pleasure in the dead of night, but that's neither here nor there.
And he may have had a bunch of different recordings with Leo's voice was smooth, or dark, or practically purring in his ear that made him lightheaded.
...Okay, maybe Donnie had a problem.
But as Leo chattered on about this and that to him, distracting him from his work, he looked back on exactly when he had fallen for his slick slider.
He couldn't pinpoint an exact moment, but it had felt like an eternity.
And he would gladly have Leo in his bed, but that would require talking in a charismatic way that didn't make him sound like a creep. Which, Donnie simply did not have.
So he never tried with the chance of success being so low. Satisfied with just being beside him and interacting with him in the way that was most socially acceptable, and taking little mementos to satisfy those darker desires.
He didn't like the feeling in his stomach when he imagined if confessing ended badly.
Leo poked him in his forehead to pull him from his thoughts. "Don? Don, you in there?"
He swatted at his hand a couple times, huffing. "Yes, I assure you, I am fine. I was just thinking about *important* things." The softshell narrowed his eyes at Leo, playing the part of annoyed sibling.
Leo was irritated for a split moment before smiling again, as if he wasn't just annoyed in the first place. "Ouch twinnie, you wound me. What could be so important that it takes up all of that forehead space, hm?"
Donnie could feel the vein in his forehead threaten to pop out as he grimaced.
Leo could make him so angry with him so easily, and he'd be lying if he didn't want some of these playful arguments to end with a rough pinning down. And honestly, Donnie hoped he pissed him off too. Both fantasies were equally as tempting, no matter who snapped.
Donnie took a deep breath and answered cooly. "My caluclations for my new algorithm that will serve as programming for my-"
Leo groaned and interjected. "Borrring. You fill up your head with all this nerd stuff all day. Where is room for the pizza and the skateboarding?" The slider continued to poke at his temple annoyingly.
The genius snapped at his offending finger and he withdrew with a yelp. "Ay! No biting!"
That made Donnie chuckle, smirking. "Then don't put your finger where it does not belong."
He focused back on his work, expecting that to be it, but then Leo leaned close and purred in his ear, a playful challenge hidden in his voice. "Then where would you like it, hm?"
That single comment crashed his concentration and he broke the equipment in his hand and wipped his head around to face the grinning turtle. "*What.*"
Just for Leo to double over laughing. Donnie's tiny bit of hope weighed back down in his chest and he grumbled, and tossed the broken tool in the trash out of the jokester's sight.
"O-oh man, Dee! You should've seen your face! I thought you'd react to that, but that was priceless." Leo was too busy being proud of his tease and wheezing in laughter for him to notice Donnie's ire of accidentally being made fun of.
The softshell couldn't tell what he wanted to do more. Shut him up by stuffing his throat with something and ride him, or make him scream his pretty voice out so he wouldn't be able to joke anymore.
He took a dark expression before getting out of his chair and walking to the door. He'd better leave now instead of staying and risking doing something drastic.
Leo was wiping his tears away when he realized Donnie was leaving. His voice was still amused, but bordered concerned. "Oh, come on Donnie baby, that wasn't that bad was it?"
That nickname again shot another twinge of desire through him and he turned back to muster a glare and a growl, before quickly retreating to his room, leaving Leo behind.
He bust through his purple coded room with irritation and urgency. He swung the door behind him and locked it.
Just enough time for him to sit on his bed and toss his shorts off, and rub himself enough times till his anger dissipated and he could think clearly again.
He laid down on his bed, mind blissfully wading through endorphins, before his eyes roamed the room lazily and fell something interesting.
He owned a VR headset ever since they came out. One the rare events he was alone and not working on tech, he would be playing games on the device.
But there were also more lax things to do in virtual reality. Little shorts to watch, exploratory games, and Donnie knew they made custom games and apps for it.
His eyes grew wide as an idea popped into his brain. If he couldn't have the real Leo, then what's the harm in curating a fake Leo? It wasn't as if it was actually him. But... it could sound and act like him.
One that wouldn't freak out on him if he wanted to indulge in those fantasies he hid in the closet.
He knew what his next project was.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
It hadn't taken too long to figure out.
Just a month after the idea made it's way into his genius and slightly unhinged mind, Donnie had a good prototype all ready for a test run.
He had programed a private app that was a mix of scans from his room, a model made after the various videos and pictures he had of Leo, and a wonderful AI he curated from the many favorable audio logs he had of the slider for his voice.
Granted, he made it a bit too complicated for his headset, so he had to upgrade it for it to run smoothly, but no biggie.
Once he tried it on, he had to take it off after less than a minute, because he feared his brain couldn't handle it without *feeling* something down there. He checked, and yes. He was soaked.
So he adjusted. He wanted to make a form-fitting suit and use it to feel whatever the program gave him, but unfortunately, he didn't have the parts on hand.
He tried it again with his ninpo to see if that worked, but it just felt like he was expecting the touch and compensating instead of getting that unfamiliar feeling of another making contact. Also, it left mystic tingles all over that he did not care for.
Huffing in frustration, he was forced to order the parts and they would not be in until next month.
Another thing that he *did* have was a reptilian dildo that was a neon blue that he used for special occasions. It may have been a bit too big to be Leo's actual size but he wanted to indulge a bit.
He would rather have had the adjustable suit that could swing different textures and feelings without the use of anything else, but he couldn't wait that long to finish this project.
At least, without enjoying it a little first.
He grabbed a few trusty toys along with the custom dildo, and took a deep breath on his bed, staring at the celing, the headset on his chest.
He recounted the checklist in his head. The door was locked. The code was right. The headset worked. The line of toys was easy to reach without being able to be bumped easily.
Donnie took another breath, finding himself ready and got into position. Sitting up with his shell against the pillows, and shook a bit when he slipped the device over his head and aligned the eyes perfectly and snugly.
It only took a click and the program began to play and a smooth, familiar voice greeted him. "Hello, Donnie baby~"
Donnie's breath hitched as soon as he was greeted with the sight of his room, but instead there was a very happy and seductive slider over him.
The progam Leo churred deeply at him, and leaned in close to nuzzle his cheek. He deeply wished he had the suit and he could have felt it. "I missed you. You've been so busy lately."
Leo pouted dramatically and whined flirtatiously into Donnie' ear. "So busy that you couldn't even see me? I'm hurt, pretty boy."
Donnie gulped and felt his breathing deepen. "S-sorry. Just got... distracted I suppose."
The AI laughed as lovely as the real Leo did. "I know. But~ could I interest you in something *else* distracting?"
He watched Leo shift down, purring and eyeing the softshell's body like as if he was the most tastiest treat in the world, and pressed kissed down his plastron that left a sparkle of phantom feeling.
Fuck, he really was a genius.
The grin Leo shot him as he spread his legs and shimmied his shoulders under made his blood run hot.
Donnie was struggling already and panting as he moved his legs to echo what was happening in the simulation.
Leo made a big show to press kisses in his inner thighs, soft and gentle and each time he got a bit too high Donnie quivered, unable to look away. He got the toy he used for oral fantasies from his nighstand.
But he was playing with him, only going as high as an inches from his core, and Donnie's tail flicked in impatience, a quiet growl rumbling in his throat.
"Leo..." partly a warning and partly a whine fell from his mouth, and the striped brat only fucking chuckled in responce, his grin going wider.
Pizza Supreme, if only he had that goddamn body suit so he could shove that brat's head in between his thighs.
He only seemed to read his mind and lunged for his pussy, and he could only imagine his breath ghosting the lips, and he spoke so smugly. "Impatient, aren't we?"
Donnie gasped at the sudden move and only wanted to kick him even more for stopping short. "Leo. I swear to fucking-" a sudden jolt gone down his legs when the tease finally made contact.
He turned the toy on low and moaned as Leo got to work, chuckling with a face full of flesh, and lapping up the slick was was gushing down the softshell's tail, all while his eyes never broke from his face.
Donnie was shaking and moaning. Even though he knew he was technically controlling the toy, as long as he only thought about what was in front of him, Leo was working his silver tounge on him instead.
Lewd sounds of both the river coming down his legs from Leo teasing his clit, only to lock his lips on the bundle of nerves and suck hard, caused Donnie to cry out in pleasure.
While he was whimpering under him, Leo kept between chuckling and purring.
Leo took a break from his clit to run his tounge against his folds and lap up the mess he was making against his sheets.
He was a groaning and panting mess when the slider lifted his mouth off of him and licks his lips slowly, enjoying it. "Mmm~ Why didn't you tell me you tasted delicious, baby boy? Fuck- I could do this all day."
Before Donnie could get enough of his whole being to stop shaking to answer him, he gasped as Leo had gone right back to lapping at his clit.
He felt like he was boiling and every nerve was extra sensitive to everything Leo did. He didn't expect to be so damn warm, feeling his flesh burn.
Donnie tried to keep up with the simulations every move with what he could do in the real world, copying everything Leo did, just to keep the illusion alive.
Until Leo made a show to rub circles around his senstive nub is slow and methodic circles with his tounge that made Donnie melt and moan over and over.
Shaking and chirping from the overwhelmed feeling of how good it all was, Leo had gone back to suckling on his clit and his legs kicked involuntarily as he let his moans echo around the room.
He didn't care that he was being loud. With him eating him out like a man starved, his pride could go to hell. His room was sound resistant anyways-
Donnie got torn from his thoughts when Leo gone back to licking and teasing his folds, looking at his softshell like he was the one blessed to see the irritable inventor fall apart like this.
Leo played with him like this, flicking and circling and sucking and licking- until it grew a bit too much and his core began to wind up in pleasure.
He laid back, chirping at how soon it was for him to be building up to a climax as soon as it did. He whined in warning and Leo looked up at him before smirking and doubling down on how hard he was eating him out.
Donnie came screaming, arching his shell up and pressing the toy into his reddened and sensitive clit before the waves subsided.
The AI heard him come undone and Leo chuckled again, popping his lips off of his folds. "There we go~ Look at you Donnie baby, all good and out of it. You're adorable."
Donnie huffed, satisfied but slightly embarrassed at being called adorable. He tried to hide under his arm but chuckled when he realized that wouldn't work with the headset.
Leo got up from his spot, still licking his lips and teeth. "Y'know, I *was* planning on stuffing you full, but if you're too out of it we could stop-"
Donnie could not have gotten up from the pillows any faster, glaring at his twin. "Don't you fucking dare." Which earned him another beautiful and vibrant laugh.
The slider smirked and leaned in close, his voice sweet but full of desire. "Good boy." Before he could fully process that new wave of arousal, he watched, confused and Leo laid down next to him on his bed.
Leo only had his smug smirk on, and closed his eyes. "But, I am kinda tired. You wouldn't mind taking the lead, would you?"
Donnie glared at him again before smiling himself, and getting up from his spot and grabbing the dildo while he was at it.
He straddled Leo's hips and took the toy, and sitting on it's shaft, letting it bend under the weight of his tail, and he sat on Leo the same way. "Fine. But I get to set the pace since you were so merciless with me."
Leo seemed thrilled with this idea and laughed in disbelief, leaning against the pillow in an obvious and comfortable way that made him twitch a bit more in annoyance. "Oh? You're gonna tease me? Oh, I bet this'll be good."
Donnie smirked darkly at him and lifted himself up, his tail flicking excitedly. "Who said I was going slow?"
He only gave Leo a second to let that sink in before taking him whole in one go. The movement surprised the both of them, and Donnie swore as he bottomed out and felt his plastron give a bit, entirely full.
His lungs couldn't take full breaths under the buldge in his body, and he looked down in disbelief. He never taken this toy without any lube or easing it in before. The stretch was something he absolutely needed.
Leo was now the one shaking, holding on to that signature smile like it was his last foothold. "Dee-- you shouldn't have taken me that fas-- shit!"
Donnie couldn't help the grin he had when he used his thighs to come almost all the way off of him only to slam the all the way back on him to the hilt, and he loved the way Leo choked on his words.
Leo's smile flickered as a deep moan came from him and he looked up at Donnie like the air got punched out of him. The near evil look he gave made the slider's eyes widen in worry.
Donnie wanted to make him fall apart, and that's what was exactly what was going to happen.
He pushed his thighs to work as fast as they could bouncing on Leo's dick, and the poor slider had that smirk wiped clean off of him in favor of load moans, and grunts. Desperately clawing at his hips to get him to slow down.
"Don--! Donnie baby. Fuck-- please! Please just- agh!" Leo's face scrunched up in overwhelmed pleasure, and Donnie wished he could take a picture, he looked so damn beautiful like this.
Good thing the genius already had the idea to record all of the sessions as long as the app was open.
Soon after Leo held on for his life, Donnie wasn't fairing too well either, he wasn't nearly as composed as he hoped he would be.
The softshell had his jaw lax, panting with his tounge out. Loud moans of his own filled the room as he panted, the large blue toy rubbing near painfully against his insides.
Leo let out a broken whine, with one eye cracked open, voice shaken and desprate. "Donnie, slow down, or I'll-- *Oh fuck.*"
Donnie watched Leo come undone under him, his shell pressed against the mattress as his body convulsed.
He absentmindedly blindly found the pump to the dildo and pressed the plunger, filling himself with a fat load of fake cum. He looked down in the simulation and purred at the mess spilling out of him.
Leo blinked slowly back to the scene in front of him, and Donnie wagged his tail, flicking the mess between his thighs on the sheets. "Almost, 'Nardo. You can rest after I get to cum again."
The pretty and spent slider flinched as he was stroked again by his walls, hanging on to the other's hips for dear life as each extra pump earned him a jolt of oversensitity. "Donnie!"
The softshell purred in contentment for a moment, taking all that he was worth, and rising him back to breakneck pace.
Each slap of their hips was loud and wet, and Leo had tears in his eyes and broken moans were falling from his mouth. Donnie was enjoying every second of it.
"Oh, Leo! Fuck, Leo. You fill me up so good. So fucking good." Donnie's pitch was going higher, keening with pleasure. "Newton, *yes*."
His body jolted when he rolled his hips in a way that caused a bolt of pleasure that made him cry out, and he halted his hips in shock.
Leo looked up, only needing a second to a figured out what happened, before smirking up at him.
Donnie's eyes widened in recognition of that very look that he was going to do something especially cheeky-
He used the hands that were on his hips to slide over the purple markings to the his thick thighs, and impaled the brat on his cock.
Donnie choked, his hands moving to stabalize himself behind him and Leo purred at him. "You want it so badly? Then take it."
Donnie screamed as he was used like a toy, bouncing on the dildo, hitting his g-spot every time. Drool was escaping his mouth as he was pistoned, screaming Leo's name.
"Leo! Leo! Oh, fuck-- fuck. Fuck! Leo~!" He screeched into the room as his orgasm hit him like a steam train, and his vision whited out.
When he came back around, his brain shifting through the fog of pleasure, Donnie was greeting with the lovely vision of his twin nuzzling his cheek and purring at him. "Hey. Back down to earth yet, Don?"
Donnie grunted, but smiled warmly at it all. That felt way better than he could have imagined. It did feel amazing even now.
Leo smiled fondly at him, lying right next to him. "Yeah, yeah you are. Hey sweetheart. Doing okay? You went pretty hard."
Donnie nodded slowly, his motor functions starting to come back. "Affirmative. I'm okay."
That earned him a snort from his dreamy lover, and he fished out his striped arm to hold his cheek. "You're such a nerd~ I love you."
The genius beamed at him. Swimming with endorphins the size of an ocean, the way Leo called him a nerd hadn't felt demeaning like the real Leo had. It was fond, warm.
He sighed and leaned into his hand. Enjoying the simulation for one last moment before reaching up and taking the headset off, and he was left in his bed. Soaked and alone.
As high as the virtual experience was, Donnie was left to face the low of reality. Alone in his bed with a massive dildo still stuffed in his slit, fake cum soaking into his sheets.
He sighed, and pulled the toy out with a soft pop, and got up on shakey legs to clean up.
Leo thanked his lucky stars that he had enough time to slip under the bed before Donnie could take the headset off.
He watched from the shadows carefully as Donnie wrapped his toys in the sheets and ripped the cloth off the bed, and put on some shorts to walk out of the room.
Leo finally felt like he could breathe and looked down at his phone, still recording. He hit stop, and snuck out of his room as fast as he could, avoiding the path to the laundry machines.
Only once in the safety of his own room, did he finally allow himself to relieve the sounds of moans on the other side of the door, and the absolute shock of Donnie using his name.
The way he screamed for him while riding a *blue* dildo, having machines imagine the senario for him, of *them*.
Leo sunk to his floor, a disbelieving smile as he shivered. Oh, oh this. This was truely a dream come true.