16-year old April O'Neil was sitting dejectedly on her new bed, located in a holding cell in the Technodrome. She was thinking back to how she was captured. Kraang Prime used her own powers against her. Being nearby to her and the ninja turtles as they were fighting his minions, he opened up his mind more completely to the Krang hive-mind and projected their thoughts into April's head. The thoughts from so many minds overwhelmed her and made her faint, but not before she involuntarily sent out a psychic shockwave that gave the turtles debilitating headaches. Several of his minions were affected as well. While the turtles were holding their heads, several of them grabbed April and ran.

The nature of her capture made her feel like a burden. It made her wish she was just human instead of a human and Kraang hybrid. There was also a slightly green bump on her upper arm that was a bit itchy. Her thoughts were suddenly interrupted by the door to her cell opening. She got up and looked out of it, but didn't see anyone. Or hear anything. It had been quiet for a long time, but she was too deep in her own thoughts to notice. But now she did, and it seemed odd. She focused and could sense the presence of the four ninja turtles getting closer. She carefully rounded a corner and saw the four headed towards her. She bolted towards them and almost launched herself at Donnatello, giving him a big hug. Raphael and Michalangelo put their hands on her shoulders.

"Guys? I hate to spoil the reunion, but can we save the group hug for when we're out of here?" Leonardo said in a quiet voice.

She held Donnie's hand as they all walked through the corridors of the Technodrome. She heard no alarms. In fact, she only heard their footsteps. She was starting to expect a trap.

"It's too quiet. I don't like this. We should be careful." she said.

But she realized there was no trap when they exited the place. This and the bump on her arm made her feel an unease that followed her back to the sewers and cut into the relief she would have felt to be safe again. She called her dad and let him know she'll spend the night there. Her unease made her stay up long into the night, but eventually she fell asleep.

When she woke up the next morning, she rubbed her eyes and, to her shock, saw that her hands were pale green. She rushed to look into a nearby mirror and saw that her face looked almost exactly liked that of the other ninja turtles. The only differences she saw were that she she still had her red hair. She was starting to panic, but made an effort to calm herself, as she did not want another "incident" like the one that led to her capture. It didn't work very well, especially when she looked at her chest and saw that her shirt was stretched more tightly. She also started to feel that tightness. She rushed out of her room and into the living room, where the four turtles were almost done eating breakfast. Everyone stopped what they were doing and focused their attention on her.

"Guys! P-please, can you look at my back and tell me if it looks different. Cause... Cause it feels different." she said frantically.

"Hey, uh... relax, April. No need to get so worked up when we don't even know..." Leo started to say.

She turned around and lifted up her shirt.

"Well? Is it?!" she asked in a distressed tone.

There was an outward curvature that looked like an oval dome on her back. It was a darker green than the rest of her, but looked quite feature-less. It was also smaller than the shells of the other four mutant turtles in the room. This was because her transformation was not yet complete.

"Looks... kinda like a shell." Michaelangelo said.

She made a weeping sound. Donatello got up, went towards her and put his hands on her shoulders.

"April... I'll fix this. Okay? I. Will. Fix this. That's a promise. Tell you what: I'll take a blood sample. And then, maybe you should have some breakfast. Okay?

She pulled her shirt down and gave Donnatello a hug. He was the one she spent the most time interacting with and felt the most kinship with. His reasurrances did make her feel better and hugging him continued the process.

"Okay. I'll wait for you to get what you need. Here at the table." she said in a clamer voice.

She quietly ate breakfast while Donnie set up his equipment. After a few minutes, he came back with a syringe and took a blood sample, then went back to his room to analyze it. There was an awkward silence at the table, which she eventually broke.

"Sooo... how do i look?" she asked.

"You look... You look like us. But prettier." Michaelangelo said.

"Thanks. Uh... Do you guys have any... trouble moving around? What with the shells?"

"Not really. Well... I can't sleep on my back. And i prefer stools over chairs. I think it's... natural for us. You know, to be us." Leonardo said.

"How do you function without a shell?" Raphael asked.

"Good point." April said.

"Have you been feeling any different? Besides the... obvious." Leo said.

"No. Everything else is fine."

She continued the small talk for a while. By the next day, April had stopped transforming. She now looked like the other four, more or less, except she still had her hair. She had created a new set of clothes for herself: a strip of pale yellow leather that resembles the plates over the chest of the four boys and a pair of jeans. The chest covering had rings going through it that connected to bands over back. These were also connected to eachother in a kind of net-like pattern. Over the next few days, Donatello kept looking for a way to reverse her change. But April was starting to like her new form. She already had some martial arts training. Now she truly was starting to feel like one of them. She strated training with them and going on missions more than before. Though, she immediately ran back home whenever she felt the smallest hint of Kraang's presence, something that her team-mates understood and accepted. She regularly talked to her dad, though she had to come up with excuses for why she couldn't come home. She knew she eventually had to tell him the truth. She wanted to stay in this new form. If Donnie ever found a way to get her back to her old self, she would only accept it if it was temporary. If she could go back to being a mutant ninja turtle like the others.

She found herself asking Donnie about his progress. But only to talk to him, since she did not care about the state of the cure. He was more shy than she was. But their relationship moved into hand-holding and then small kisses, most of which were delivered by her.

Then, one night, she came to his room to talk. But only as a prerequisite for something else. He told her that he knew the cause of her change, but still no idea how to reverse it. She apologized for the psychic explosion she caused when she was captured, but Donnie assured her it wasn't her fault, then told her about a helmet he'd been working on that might prevent such things in the future. He again apologized for not having a cure yet, but she stopped him.

"It's OK. I actually like being this way." she said.

"You do?" Donnie asked.

"Yeah. I mean... i kinda already felt like i was one of you before. But now... even more so. I just feel like i belong, you know? I wanna be... with you."

Her face was very close to his when she said that. He got a good look at her. The same eyes, the same hair as before. Even the same frame. Her mouth was a rounded tip and she had two small nostrils instead of a nose. But to him, this only made her look even more beautiful. He wanted to kiss her, but couldn't bring himself to do it. Instead, he nervously gulped and shifted his gaze to the side. In that moment, she wanted the same thing he wanted. So she just kissed him. Donnie was initially surprised, but quickly gave in to to his desire and kissed her back even more passionately. His chest was against hers and their hands were on eachother's shells. She moaned softly and ran her fingers down the sides of his face, then neck, then chest. Even with his organic chest-plate preventing it from having as much sensation as that of most humans, it still felt wonderfully soothing. She broke the kiss and looked into his eyes, then placed her hands above her breasts. The leather covering was somewhat form-fitting.

"Can you help me take this off?" she whispered.

"O-okay." he whispered back with a shaky voice.

She used four separator keyrings that connected two sets of straps to hold a patch of leather over her chest. They were quite easy to open. She put her hands on the covering while he opened all four, then let go. It fell to the ground and he now saw her naked chest. Smooth, green skin. Medium-sized teardrop-shaped breasts with areolas that were a darker shade than the rest of her and nipples that were a lighter shade. A flat abdomen. It was certainly not the first time he had seen a naked woman. But it was the first one that was actually right in front of him. That he could touch. And it got his heart racing. Technically not a woman. She was 16 and he was 17. This did not matter to either of them.

He ran his left arm up and down the side of her belly and he used his right to cup and gently squeeze one of her breasts. She took the hand that was caressing her breast and locked her fingers with it. He had only three fingers on each hand and each was thicker than any human fingers she ever saw. She still had all five of hers. She pressed her chest against his and started kissing him again while her right hand moved down his shell, which stopped at his butt. Her hand stopped on one of his hips and then slowly moved to his butt. He was wearing shorts that stopped at his knees and were somewhat tight around him. She was wearing full-length jeans that were even tighter, molding themselves over her long legs. Not so much over her ass. But as Donnie also moved his hand downwards, he could feel it was quite shapely. She could feel his throbbing erection over the layers of fabric that separated them. She started unbuttoning his pants. They fell to the floor. She then stopped kissing and looked at his crotch. His hard cock made a very visible "tent" in his underwear. She hooked two fingers from her right hand beneath the rim of the underwear, one on either side of his dick, then pulled it down, revealing his penis and testicles. He was uncut. The shaft was almost the same shade of green as the rest of him, as were the balls. The glans was a faded red. And there was already a bit of precum on it. She gripped his penis and it immediately started twitching. It was moderately thick and long, and its warmth and hardness felt nice in her hand. She very slowly started stroking it and it twitched again. He couldn't help but move his hips upward slightly. More precum leaked from his urethra. She saw his eyes close, his face point upwards, and heard him moaning. These signs of arousal made her aroused as well. She kissed his cheek while rubbing her pussy through her pants. She felt her own wetness on her fingers. A few more strokes and she stopped, then took a step back from him and hooked her thumbs into her pants.

"Would you like to... do the honours, Donnie?" she asked in a breathy whisper.

"I... I would love to."

After completely removing his underwear, he then started unbuttoning her jeans, somewhat fumbling in the process. Afterwards, he kneeled as he pulled her pants down. He saw a wet spot on her underwear. He then put his hands on her hips. As he hooked his fingers into it, she placed her hands on his and moved them down alongside his as he pulled down her underwear. He saw her pussy in all of its wet, naked, aroused glory. The lips were about the same colour as the rest of her, but a bit more pink, seemingly. Between them was a brighter shade that looked almost red. He got his face in close to it as he started groping her shapely, round ass. She could feel his warm breath on her pussy. It made her lightly shudder. Then, without warning, she felt his lips on it. He gave it a series of kisses, then started sucking on the labial mound. He could taste how very wet she was. Her pussy juice tasted slightly salty. She started moaning and running her hands along the back of his head, slightly moving the mask that was over his eyes. He took it off and put it on his shoulder. After a few seconds, she grabbed his cheeks and moved her hips away from his mouth.

"Stop, stop. Come... c'mere."

She helped him get up, then pressed her open mouth against his without kissing him and slowly rubbed her pussy against his cock.

"When i cum, it'll be with you... inside me."

"You... s-sure?"

"I... don't think i've ever been so certain of anything. Yes. Have a seat. On the bed.

He sat down on the edge of his bed with his legs spread and his dick standing at attention. She pushed his legs a bit closer together, so that she could get her legs over his. Her pussy was right above his cock. She spread it open and revealed to him the bright-pink, moist flesh within. A drop of her pussy-juice landed almost squarely on his urethra and mixed with his precum. She hold his cock with one hand and spread open with the other. Donatello gulped. He could barely believe this was happening. He was about to have sex for the first time in his life. April was thinking much the same thing. She lowered herself until her pussy slightly enveloped the tip of his dick. She looked at him as if asking for approval. His wide-eyed face slowly nodded in approval. She continued lowering herself and her pussy slowly swallowed up her lover's eager hard cock until she reached almost the hilt. As she did, she kept eye contact with him. As she took him into her, her eyelids gradually closed. When she took him fully, her eyes were half-closed and her lips formed an "oh". Her thighs were now resting on his. Donnie closed his eyes and his louth formed an "ah". He squeezed one of her thighs with his right hand and moved his left hand tenderly up and down her abdomen. His cock twitched several times in quick succesion now that her wet pussy fully covered it. She did not have a hymen to break. Her legwork exercises and the martial arts training she did everyday had torn it apart. And so this penetration drew no blood. There was mostly the magnificent feeling she felt from taking a real-life cock inside her for the first time. With how wet she was, the passage inside caused her very little discomfort. 

Donnie slowly started moving his hips up and down. She started lifting and lowering herself onto his member at a slightly faster pace. He slowly picked up the pace until he was pumping into her at a steady pace while pressing his head against her chest and looking at her. She felt her orgasm approaching. Just seconds before she climaxed, she kissed him. Her lips were locked onto his as she squirted and gave a long muffled yell as her juices splashed onto his crotch. Her fingernails scratched at his shell. Donnie felt his own climax fast approaching.

"I'm... very close... to my orgasm... April."

"Give it to me. Fill me up. Fill my pussy with your cum, you sexy stud."

He grabbed both her thighs and jack-hammered into her for the final stretch. After a few seconds, he came. It was a series of long, furious spurts. It felt like he was cumming harder and with more volume than he had ever ejaculated in his life. His white seed leaked out of her overflowing pussy and dripped down his balls, mixing with the orgasmic fluid that April had leaked onto them. He held her tightly as he filled her. He held his mouth clenched tight and moaned, not wanting to make to much noise. Neither wanted the others to know what they were doing. After he was finally done cumming, his hands hugged her less and less tightly and eventually went limp, falling to his side. He held his elbows underneath him as he reclined. His eyes closed, heavy breathing and head pointing upward made him look absolutely spent. It was the most wonderful workout he ever did. On top of him, April looked the same. Her sleek, sexy body was shining with a coat of sweat. They both there untill Donnie's now-soft cock fell out of her and a large amount of semen leaked onto the floor. This mess bothered neither of them.

They lay on their sides in his bed kissing eachother, still enjoying post-coital bliss. Afterwards they stared at each other while Donnie caressed her hair.

"I didn't know you... felt that way about me. You know,... that you felt i was more than a friend." he said.

"I thought i was being... pretty obvious." she said.

"Guess i missed that. I mean, me and the boys were raised in a sewer. We don't... get out much. And we tend to not want attention. Or maybe... it's me."

"Well, now you know."

"Yeah. I'm glad i do."

As they talked, his sperm was already racing towards her ovum. Soon, two of his swimmers would pierce it. That night, they had another session of lovemaking, with both of them going down on eachother in turn, and both gladly swallowing eachother's juices, then calling it a night and sleeping in eachother's arms.

The next day, Donnie was cheerier than normal during breakfast. When asked about the cause, he lied and told the other three turtles that he had made a breakthrough just that morning. April felt happier too, but in order to not attract suspicion to them, she hid it as best she could, resulting in her acting a bit awkward. On that same day, she decided the tell the truth about her new situation to her father. She went to her home and allowed him to see her new mutant turtle appearance and explained how she got that way. He was surprised, but understanding. Above all, he was happy that his daughter was unharmed. Then, after a few weeks, the morning sickness and pregnancy cravings hit her. She did not consider this possibility, thinking that they were either too far apart in terms of genetics or that her change had left her sterile. But she gradually warmed up to the idea of having a baby. He was the first to know. He soon made his own ultrasound machine and saw on the monitor two eggs that were bigger than turtle eggs. And within each was a small humanoid with a wide back. With fear and shame, they let Master Splinter know of this. He was understanding, but told them they had to take responsibility. They would care for their babies when they were home and he would take care of them when they were away. During the conversation, Donnie remarked that Splinter would be an awesome grandpa. After he let the other turtles know, they started gradually acting congratulatory and generally more "bro-y" towards Donatello. Even Leonardo, though he never teased him about his relationship or their future baby. The hardest part was April telling her dad about this. But after she eventually did, they both felt like a weight had been lifted of their shoulders. They were ready to face this new challenge together.