Title: Survival of the Species

Rating: R (for incest)

Summary: SLASH M/M relationship. Sort of.Gender switching, emotional distress, inner turmoil.

Chapter 1

Michaelangelo glanced at Leonardo as he sparred relentlessly in the dojo. The fine and taut muscles on his brother's arms stretched as he moved delicately into each move. He was so perfect, so demanding on his own physical endurance.

Mikey sighed. He looked back towards Donatello who moved quietly about his task in the small room adjacent to the dojo. Donatello seemed puzzled and his eyebrows were slightly raised in confusion.

Mikey rubbed his arm "So what's the verdict, doc? Am I going to live?" His voice lacked mirth as he cracked the feeble joke.

Donny looked sharply at Mikey for a moment, as if to say 'shut up'. "I think you'll live Mikey. This is just ... A little odd".

"Odd?" Mikey looked worried. "Why odd?"

Donatello shook his head, uncertain. "I'm not sure, bro. This could be the start of a lot of things. I don't want to make any assumptions to what might be causing the severe headaches, the fevers and the constant loneliness you've been suffering".

Mikey sighed and rubbed his arm again, the tender area where Donatello's injection had inflamed the skin earlier still felt a little numb from the blood loss. Mikey hated blood leaving his body, the sense of weakness and vulnerability.

"What the hell is wrong with me?" Mikey mused more to himself than to his fussing brother. "Why am I feeling like this?" His eyes drifted to his brother sparring in the dojo. He glanced at the well toned body and felt a sudden rush of excitement. This feeling spread all over his body, making him feel exhilarated and ashamed at the same time. His cheeks reddening, Mikey turned away and concentrated on Donatello.

"Is there any new sensations or feelings you want to talk to me about?" Donny asked, allowing a drop of Mikey's blood to fall onto a microscope slide. Mikey shook his head. He wasn't about to try and explain his new feelings for his elder brother. It shamed him immensely to feel so intense about Leo. However, he could not deny the feelings were causing distraction from his sparring and studying.

It was a completely different experience, this feeling. It differed from his emotions towards Donny and Raph. They were his brothers, but for some reason, he could not feel the same about Leo.

"This is impossible" Donny murmured. Mikey turned to face Donny and patiently waited until Donny looked up to him in utter amazement.

"What's wrong?" Mikey asked worriedly.

Donny waited for a moment and walked over to Mikey. His voice was soft as he answered the question he would have never believed would be asked. "Mikey, your mutant cells are changing, become more intricate".

"What? Am I dying?" Mikey asked fearfully.

Donny smiled reassuringly. "No. Nowhere near. Your cells are becoming more intricate, they are evolving to suit our species. Mikey, did you know in South Africa some species change sex to continue the evolution and survival of the species?"

Mikey looked confused. "What does this have to do with me?"

Leonardo walked briskly into the room and sat beside the two turtles, momentarily distracting them. "So, what's the verdict Donny? Is Mike okay?"

Donatello was still looking amazed as he fought to regain some composure. Finally he turned to Leo and said "Mikey is an inappropriate name. We may have to start looking for something more suitable. Mikey's mutant cells have completely changed …. he's now a girl".

"A girl?" Leo looked at Mikey and shook his head confused "Good gag guys, but what's really going on here?"

Donny sighed with an exasperated sigh "It's the truth, Leo! His mutancy has evolved".

Mikey stared aghast at his brothers. The truth was hard to accept. "This can't be happening .."

"Donny's just got the verdict a little confused" Leo said, placing an assuring arm on Mikey's shoulder. Then, turning to Donatello he whispered "I want to talk with you alone, right now!"

Donatello and Leonardo left Mikey confused and vulnerable in the small room connected to the dojo. Then they walked together through one of the sewer tunnels connected with their lair.

"How can you be sure?" Leonardo asked, his confusion heartbreaking.

"I'm a scientist, Leo. Trust me, its true" Donny sighed and shook his head sadly "I know this is hard for Mikey. But I can't change the truth of the matter, and that is quite simply that Mikey has become female quite naturally. It was basic instinct drummed into reptiles and amphibians on the verge of extinction. One of their kind would simply change sex to prolong the species existence. Its something we can't avoid, something we'll have to be aware of and help him through the confusion and bitterness".

Leonardo nodded vaguely. It all seemed so unreal. How could Mikey just change sex? It surely wasn't natural. Neither was the new and protective feelings he was himself going through. Although he wouldn't admit to any of them. "Raph is not going to take this very well".

Donatello looked grave for a moment. "He's got no choice. Mikey has become this for a reason. And the reason is entirely natural".

Leonardo sighed and hoped they would be able to calm the raging temper that Raphael was notorious for.

TBC