Work Text:
Leo had a dark secret that he never spoke about. It stayed locked inside and was never allowed to show to anyone but himself. Not even his brothers knew about it, he was just too good at hiding it.
It was only at night when he would indulge in craving. Donnie had created a highly secure VPN network for the whole family to use so Leo never had anything to worry about. During the evening he would stay up late on his computer and watch things that legally he shouldn't have been. He would chat on deep web internet forums with others who had similar tastes to him, stroking his cock the entire time.
Leo would save as much as he could onto a flashdrive he kept hidden in his room, only taking it out when he knew he'd have plenty of time to himself.
The things he saw on his computer were wrong, both morally and legally, but that just turned Leo on even more. Nothing else would make him cum like it. Clutching his hand against the bed as his hips jerked and sputtered over and over.
During the day, however, it was usually much easier to hide his cravings. He was usually distracted by other things anyway and too busy to think about them. But sometimes during their nightly patrols Leo would spot a kid walking through the city with their parents. His eyes would lock to the child and ogle its tiny body. Biting his lip as he fought the urge to swing down and snatch it away and have the kid to himself. He never did though, patting himself on the back for not giving in no matter how much he wanted to.
After stopping the krang invasion, the family became a lot closer. The near death experience of it had really shown them all just how short life could be. They started to hang out together a lot more after that, and while Leo loved his family to death, the constant spending time with them prevented him from indulging himself when he needed to.
Soon his urges became stronger. One day he had glanced at an old picture of him and his siblings when they were quite young. Leo’s eyes scanned over his brother’s baby bodies, specifically Raph. His brother’s tiny, fat body awakened something inside of him, lit a fire that burned him from the inside. Leo had soon taken to touching himself to that image of Raph and fantasizing about doing awful things to his brother.
The more he fantasized about it the more depraved Leo soon became. He realized that if he didn't do something soon, he'd go too far and be found out.
Luckily, a solution would present itself not long after. Donnie had announced to his brothers that was working on something that would allow them to travel through time. He made sure to emphasize that it was still in beta and not fully finished.
Leo’s mind became full of ideas. He couldn't believe he might be this lucky. So planned it out, making sure to bring a little surprise for his brother's kid self.
Late at night, when everyone was definitely asleep, Leo crept through the lair and into Donnie’s room. He tiptoed across the floor, keeping an eye on his twin to make sure he stayed sound asleep. He looked around the room for whatever tech it was Donnie was so eager to gloat about having.
Leo shuffled some papers on his brother's desk, looking for something that might show him what it looked like. He found a folder labeled “Time Displacement Band” and was sure he'd found it. Inside the folder were pictures of the device, thankfully. Leo scanned the room for it before locking eyes on a small watch-like device sitting on a small pedestal.
He took the watch and slapped it over his wrist. The band was quite comfortable and the design was sleek, it looked like a finished product. On the face of it was a small keypad where the documents had said were for imputing the desired time to travel to.
Leo input the date with excited shakes hands, approximately ten years ago give or take a little. He pressed the activation button and the watch began to glow purple. Violet electricity radiated from the watch as it vibrated violently. Leo suspected maybe this was a bad idea but his vision went white before he had a chance to abort.
When his vision came back he was still in the lair. The shape of the room looked like Donnie’s, only with much less tech coating the walls. He glanced around the room and spotted various small pieces of technology scattered about, but no turtles.
He crept out of the room and made his way through the lair. If he remembered correctly, they all slept together in the same room when they were young. Leo came to the doorway to the room he recalled sharing as a kid. He pulled back the curtain and spotted four little turtles and a rat fast asleep.
Leo bit his lip as he realized the device had worked. He stepped closer, careful to tiptoe around them. His brother and he looked so beautiful and innocent. He saw himself peacefully snoozing away, but he kept himself from touching him. He was here for someone else.
Leo glanced over at the tiny snapper fast asleep, cuddled against a plushie. The little turtle must have been extra tired since he was still in his football jersey and helmet.
So cute and helpless , Leo thought.
He felt his slit grow wet as he inched closer to the young turtle. He pet the snapper’s arm.
Raph stirred and turned in his sleep.
“Hey, buddy,” Leo whispered carefully.
Raph stirred again, his eyes blinked open slowly. His snaggletooth mouth yawned as he awoke rubbing his eye.
“Hewo?” Raph groaned.
Leo continued to pet Raph’s arm. “Hey, little guy, how'd you sleep?”
Raph stretched his arms. “Good.” He looked up at the slider. “Who are you?” Raph hugged his teddy bear protectively.
“Don't you recognize me, Raphie? It's me Leo. Your brother.”
Raph looked over at Leo’s younger self who was still fast asleep.
“But that's Leo,” Raph whispered.
Leo nodded. “I know, I know. But I'm Leo from the future. I can travel through time, isn't that cool?”
Leo pressed his knees together, trying to contain this wetness.
“Fwom da future?” Raph asked.
Leo nodded. “Yes, from the future. That's why I'm older and bigger.” Leo bit his lip. “But I need your help with something, Raphie. I think my time machine is broken, and I need your help.”
Raph rubbed his eye and sat up. “Donnie can help. He's super smart.”
Leo shook his head. “I know he is, buddy. But this is a problem only you can help solve. I'm your brother, remember, you can trust me.” Leo smiled at the young turtle, hiding it behind it his intentions.
“Can my teddy come?” Raph asked, holding his plushie.
“Of course he can. But we've got to hurry okay?” Leo held out a hand to Raph who took it.
Leo took Raph’s hand and the two of them slowly tiptoed out of the room and into the main area of the lair. Leo led Raph through the lair to an exit into the sewer, the smaller turtle dragging his teddy behind him.
“Where are we going, Leo?”
“Just to a place where we can fix my time machine, baby.”
Leo stopped them once he was sure they were far enough from the lair to not be heard. He reached into his bag and pulled out a small bottle.
“Here, baby, eat this candy for me, okay?” Leo poured a small capsule into his hand and handed it to Raph.
Raph took the small capsule and sniffed at it. “Why?”
“It's part of helping me fix my time machine. You still want to help me right?”
Raph nodded and took the small pill from Leo. He tossed it in his mouth and began to chew it. His face contorted in disgust but powered through it and swallowed.
“Yuch!” the little turtle groaned.
Leo pet Raph’s face. “It's okay, baby. It's a special kind of candy from the future.”
Raph smacked his lips as saliva filled his little mouth to help him swallow the gross candy Leo had given him. He looked up at the turtle with round eyes.
“What now?”
Leo grinned. “Here, come sit on my lap while we wait for the candy to work, baby.”
Leo sat on the cold sewer floor and patted his thigh. Raph waddled over and sat on his lap.
Leo bit his lip and hummed. He stared at Raph with hunger. Slowly he rubbed his hand over the little turtle’s knees rhythmically as they both waited.
After a few minutes Raph started to squirm on Leo's lap.
“I feel funny,” Raph said.
Leo moaned as he felt Raph’s butt rub against him. His hand moved up to Raph’s thigh and rubbed it in circles.
“That means it's working, baby. Soon you'll be able to help me.”
They waited a little longer, and soon Raph began to whine some more.
“My tail hurts, Leo,” he whined.
“Does it? Do you want me to take a look at it and make sure it's okay?”
Raph nodded.
Leo slid his brother off his lap and sat him on the sewer floor. He told Raph to lean back a bit and spread his legs. Leo looked down between the snapper’s legs at his tail. Poking out between his slit was the bright pink tip of his cock, just barely showing itself.
“Well I see what it is, Raphie. The candy is starting to work.” He rubbed a thumb along the edge of the slit.
Raph hissed in pain and sat up. “That hurts, Leo.”
Leo pushed Raph back down. “I know, baby, I know. But it's gonna feel like this for a little bit.”
He ran his finger over the tip of the cock, making Raph flinch and try to close his legs. Leo pushed them back apart and wagged his finger at Raph, telling him to keep his legs open for him.
The small turtle hugged his teddy and shut his eyes as they began to tear up.
Leo leaned down to Raph’s tail and trailed his tongue around the opening. Raph yelped and tried to sit up, but Leo pressed him back down onto his back. The slider lapped at the cock, slipping his tongue into the entrance to coax it out.
Raph squirmed under Leo and tried to push his head away.
“S-stop it, Leo! I don't like this! It feels weird!”
Leo ignored him and continued to suck on the cock head. He could feel it slowly push its way out of Raph’s slit and into his mouth. Leo bobbed his head against the cock and moaned around it. It tasted heavenly to the slider, and he felt his own slit start to leak.
Raph’s cock continued to grow in size, eventually hitting the back of Leo's throat. The slider had to pull off the small turtle's cock as it had begun to push deeper down his throat than he could take.
“Wow, Raphie,” Leo praised, “You're so big for a turtle your age.”
Raph sniffed as he hugged tightly against his teddy. He blinked tears from his eyes and tried to look at Leo.
Leo cooed, “Aw, it's okay, baby. You're making me so proud. You're such a good boy helping me like this.”
Raph’s cock finally seemed to stop growing. It stood erect in the cool air and throbbed intensely. Leo stared at it mesmerized, he could feel his tail throbbing in want.
The slider wrapped one hand around the cock’s base, not even covering half of it.
“So big, baby. Bigger than my hand even. You're going to feel so good inside me, Raph.”
Leo crouched over the young turtle, his slit leaking heavily. He ran a finger up the shaft of Raph's cock as he angled it to his tail. He bit his lip as he lowered himself down, feeling the tip press against his entrance. Leo pushed against it, feeling his cloaca stretch to accommodate the large member.
Raph squirmed underneath Leo at the strange feeling. He started to whine at the tight feeling around his dick.
The head of the cock popped inside of Leo and he let out a gasp of pleasure. He bit his lip once more as he sunk down Raph’s cock, feeling it throb inside him.
His slit dripped slick down Raph’s member as he lowered himself further down. He kept a hand held to Raph’s body, keeping the small turtle pinned.
When Leo felt the lips of his slit make contact with the opening of Raph’s he took in a sharp breath. He could feel Raph’s cock pressing so deep inside of him, as if his organs had rearranged to fit it.
Leo looked down at Raph’s face, saw the tears in his eyes, said, “Look, Raphie. Look how well you fit, baby.”
He lifted his hips a little to show Raph’s cock buried inside him.
The small turtle creeped open his eyes and stared at his dick inside the older turtle. He didn't understand what any of it was. He was confused and scared, and didn't understand why Leo was doing this.
“Leo, this feels weird. My pee-pee hurts,” the snapper whined.
Leo pet his small face. “I know, baby, I know. But I can make it feel better for you. It'll feel good for both of us.”
The slider lifted himself up the throbbing erection. He could still feel the empty space it left behind inside him. Then he lowered himself back down, keeping a smooth rhythm.
A small cry escaped Raph's lips as Leo rode him. The unusual feeling was too much for the young turtle. He tried to push Leo off of him with one hand, while the other held onto his teddy.
Leo felt the small hand push against him as he moved. He pushed Raph’s hand away but it came back and pushed him again. Leo took Raph’s hand and held it back. He could feel the snapper squirm under him, but it made his cock move deeper inside the slider causing Leo to moan.
Raph fought against Leo, doing everything in his little power he could think of to escape. His squirming and struggling eventually loosened his grip on his teddy bear and it slipped from his arms and rolled into the slow sewerage steam.
“Teddy!” Raph cried as the bear floated away.
The snapper began to cry more. Tears streamed down his face and snot bubbled from his nose.
Leo all the while was moaning like a bitch in heat as he rode Raph’s cock. He felt it mash against his insides and press into his feel good spot. His tongue rolled from his mouth and he huffed incessantly.
He looked down at the crying turtle underneath him. Leo smiled at him; not a smile meant to comfort Raph, a smile that just showed the pleasure Leo felt using Raph like this and giving into his urges.
“Shh… Shh… baby boy,” Leo whispered in a mocking coo.
Raph looked up at Leo and sobbed at the evil smile staring back at him.
Leo picked up pace and thrust Raph’s cock deeper inside him. The small turtle’s crying echoed around them in the sewer. He was in pure bliss, his tail was leaking so much; he had never been this wet before in his life. He screamed in amorous lust as he lived out one of his darkest fantasies.
He had no idea how he had ever lived without this. Only ever satiating himself with online forums and videos on his computer. It felt surreal to Leo finally having this moment to himself.
“L-Leo!” Raph sobbed, “It hurts! It's too much!”
Leo did not slow his pace as he replied; “Just a little more, baby. It'll be over soon.”
Leo could feel his approaching orgasm. His insides twitched around Raph and squeezed him.
“Something's coming out! I'm gonna pee!” Raph screamed.
Leo rode the snapper faster. Raph was close and Leo wanted to feel the little turtle fill him up.
“It's okay, Raphie. Just let it out! Shoot it inside me, baby!”
Raph’s voice stuttered. His cock twitched and his hips thrusted upwards into Leo. He shouted as he came, his hot load shooting out of his cock like a rocket.
Leo felt Raph’s cum enter him. He groaned loudly as he chased his own orgasm. The thick liquid filled his gut. His guts squeezed around Raph and his body shuddered as he came around the thick cock.
“Oh god!” Leo moaned, throwing his head back in pleasure as he continued to ride out his orgasm.
Raph continued to pump Leo full; whatever pill Leo had given him made him ready to bust. The small turtle didn't understand what was happening at all. It felt like he just peed and it wouldn't stop.
As Raph's cock began to slow, Leo followed suit. His chest heaved as he took a deep breath, his orgasm coming back down.
“Oh… fuck…” the slider groaned.
Leo sat still on Raph’s lap. He twitched around Raph’s. He glanced down at the exhausted snapper, petting his face.
“You did so good, baby.”
Raph just whined softly.
Leo felt his stomach, ran his hand over the bulge the cock created. It felt so good inside of him, he wished it could stay there.
With shaky legs Leo stood up and let Raph's cock fall out of him. A fountain of cum began to leak from his slit. He admired the stream of thick cum as it dripped down his legs.
“You filled me up so much, Raphie. You did such a good job,” Leo cooed.
Raph's cock twitched but stayed erect as he squirmed.
“Aw, is your cock still hurting?” Leo knelt down and took the member in his hand. “Let me help you, baby.”
The slider opened his mouth and took the cock in his throat. Raph yelped at the feeling and struggled against his brother.
Leo grinned with the cock in his mouth as he watched Raph squirm. The snapper just looked so cute like that, wiggling around on the ground as his cock was sucked. He bobbed his head on the cock and felt it begin to throb. It didn't take long for Raph to shoot another load since his cock was already so sore.
Leo swallowed as much as he could. He popped his mouth off the head with an “Ah” as he finished. He stroked it softly and watched it begin to soften.
“Is Raphie all tapped out?” he teased.
The large cock slowly retreated back into Raph’s tail, leaving behind a shiny wetness around its opening.
Leo leaned down and kissed him on the face playfully then helped him stand up. Raph rubbed his tearful eye and sniffed.
“Why you do that?” Raph sniffed.
Leo brushed the dust off his brother's jersey. “Oh, baby. I told you I needed your help. And you were such a good boy for me. You helped me so much.”
Leo took Raph’s hand and began to walk back towards the lair.
“I lost my teddy…” Raph whined. He rubbed at his tail trying to make the icky feeling go away.
“It'll be okay, Raphie. I'm sure you'll find him eventually.”
Leo led Raph back to the bedroom he had found him, and helped tuck him back to sleep and the young snapper passed out from exhaustion. Leo then returned to the middle of the lair and prepared to return home. He input his destination into the watch, pressed active, and his vision went white.
When his vision returned he was standing right back where he had left in Donnie’s lab.
The softshell was still fast asleep and none the wiser.
Leo placed the time travel device back where he had found it and crept out of the room. He started to make his way back to his own bedroom when something caught his eye.
Just beyond the entryway of the lair from the sewer he spotted Raph’s old teddy bear floating against the wall. He pulled it from the water and shook the water out. It was a bit worn out, but otherwise in good shape. He took it with him back to his room, setting it on the shelf to dry before he collapsed into bed.
When the next morning arrived Leo felt refreshed. His experience from last night (or ten years ago technically) had him full of energy.
He glanced up at the teddy bear on his shelf, now fully dry and smiled. He removed it from its place and said, “I'm sure Raph has missed you, little guy,” he said sarcastically as he thought back to last night.
Leo jumped out of bed and went down to the kitchen where his brothers were.
“Good morning, Leo!” Mikey cheered, to which Leo waved and said back.
The slider walked around the table, his hands hidden behind his back. He came up to Raph who looked up at him as he ate.
“What's up?” Raph asked with his mouth full.
“I've got a little surprise for you, Raph!”
Raph swallowed his bite of food then turned his body to Leo intrigued.
Leo held out the teddy bear in his hands and shouted, “Tah-da!”
Raph took a moment to recognize the stuffed animal before jumping up in excitement.
“Ohmigosh!” he shouted, “You found my teddy? I can't believe it, how?” He snatched the bear from Leo’s arms and hugged it.
Leo shrugged. “Oh, it's no big deal. I just found it floating in the sewer.”
“Wow, I can't believe it, Leo.” Raph stared down at the plush. “I haven't seen this little guy in forever! Not since--”
The smile on Raph’s face disappeared and he stared blankly at the plushie.
“Raph, you okay, buddy?” Donnie asked.
“Yeah, you alright? Something wrong, Raphie-baby ?” Leo grinned cheekily as he spoke.
Raph’s lip quivered a little. He locked eyes with Leo and seemed to freeze. Leo’s tooth filled grin reached from ear to ear as he stared back. He wondered if Raph remembered enough to recognize him.
Eventually Raph replied, “Yeah. I'm fine.” Then pushed past his brothers and left the kitchen.
“What was that about?” Mikey asked.
Leo shrugged. “No idea. But let's give him some time to himself. I'm sure he'll tell us if he wants to.”
The slider poured himself some cereal and sat down to eat. Donnie and Mikey joined him at the table, joking and talking like everything was normal. For Leo, everything was. For Raph, it wasn't as clear yet.
Leo grinned ear to ear as he ate without a care. Future plans involving Raph concocting in his mind, and not all involved time travel.