Leo was losing a fight. He had been planning to lose this fight from the start but this notion didn't make it any easier. Neither did the fact that it was practice.  Leo had to admit that his brother improved a lot during his absence and no-weapon sparring was slowly becoming his home territory. Leo was pretty sure he still had an edge with weapons, though he had no desire to test it.

His line of thought was interrupted by a high kick he dodged. He counter attacked with a series of low blows that Raph parried, closing the distance between the strikes. Leo moved back.  Raph tried to come close to properly use his advantage of strength and greater body mass.  The blue-banded turtle tried to keep the distance.

Whack. Another high kick that Leo dodged landed in a wall. Did they cross the dojo already? Leo's eyes slightly widened in realization that he allowed to corner himself.

Raph grinned.  Being able to defeat Leo was both new and invigorating to him. Sometimes he thought that maybe Leo had let him win, but tonight was clearly not the case.

The hothead was so pleased with himself that he seemed not to notice a slight opening in his stance. Seizing his chance, Leo delivered a blow to his brother' midsection, intent to knock him aside and get onto open ground again. Raph missed the blow but the opening turned into the trap – he managed to catch Leo's wrist and use the momentum of Leo's own strike to spin him around and toss onto the concrete.

The leader should have been proud – he had shown Raph this trick in the first place – but he was too busy grouping for the fall. He still thought to roll away and get free.
His brother had other plans. Twenty stones of turtle weight landed square on top of Leo knocking him onto his back and he found himself effectively pinned down.

"Oh no, you aint going anywhere, bro"  - Raph's amber eyes were laughing.  His breath was hitched by the impact but he was really enjoying this.

There were still options, Leo knew. Had it been a real fight, he would have gone for pressure points. He probably still could struggle free using his legs. But instead he reached up and placed a quick kiss on Raph's beak acknowledging defeat.   

Raph yanked his wrists up then and pinned them above his head. Holding Leo's hands with one hand, he glided the other down the underside of his arm and the side lingering on a subtle border between the hip and the thigh.  Tilting his head a little, he watched his leader breathing falter for the first time this evening.

The pulse point on Leo's neck was beating visibly. Raphael was always fascinated to see his brother come undone like this from a mere touch. He ran his calloused hand halfway up Leo's plastron before stroking back down a little more persistent this time.  His fingers were sliding along the scutes right to the spot where Leo's cock was hidden and Leo tensed anticipating Raph's fingers to touch the delicate area.

However at the last moment Raph's hand turned aside and came lower down to caress the delicate skin on Leo's thigh. That earned Raph a strangled sound that escaped the lips of his usually impassionate brother before the blue-banded turtle regained his control and pulled his hands free.
"Not.. not here, Raph. Everyone is still up"

Emerald turtle squatted back, a slow grin never leaving his face. His voice was a thick rumble when he answered: "Your room then, Fearless".

Leo rose and went for the door not bothering to answer or even look back. The Lair outside the dojo was full of sounds. TV produced some frantic mumble punctuated by flickers of light. It probably was some nonsense TV-show, no wonder Mikey was rooted to the couch totally fascinated by it and oblivious to the surroundings.

Soft cracking of the veteran wheelchair, followed by a sigh and a burst of clicking told Leo that Don was still in his lab. Unmistakable aroma of the freshly made jasmine tea and a thin ray of light coming through the shutters hinted that their father was enjoying his supper tea in private.

The path was clear and the blue-banded ninja gave the "all clear" sign. He didn't need to look back to see if Raph was following him to his room – the hothead's presence behind made his skin burn and legs feel warm and numb.  He just hoped it didn't show.

Silently they tiptoed to Leo's room and shut the door behind them.

Just as they were gone from sight, Mikey turned to stare speculating at the shut door. He's been wondering what the two were up to for quite some time already.  There were all these subtle changes you cannot really put a name to.  He's  tried hinting, he's  tried to interrogate Leo in an innocent matter, shell, he even tagged along Raph's and Casey drinking night out hoping that a little alcohol would untie Raph's tongue.

That night's been nothing near "little". The hangover was also huge. And he didn't remember much of it, which was probably for better.

First he thought that they were preparing some secret present for the Mutation Day. He'd even searched Leo's room while Leo was out on a supply run. Found some boring books.
This whole mystery was challenging his detective powers as well as ninja skills, and Michelangelo loved a good challenge.

****
They were doing this… thing for some time already and Raph felt it was time to maybe move a little further. Kisses, handjobs and even blowjobs occasionally were fine, but surely it wasn't all it was about?

Sometimes late at night he dreamed about Leo trashing under him, flushed, with sheen of sweat on his skin and lust in his eyes.  Leo in his dreams would open up for him, beg him to take him.  And he would pound into his brother's hot wetness, make him shiver with pleasure.  Leo would suck at his fingers while he fucked him and that was usually the point when Raph woke up to his own orgasm, screaming.

In the morning he had to admit that he was having nightmares again, and shrug off the mild concern of his family. He's never told anyone – least of all Leo – what kind if "nightmares" he was having.

Raph didn't remember when it all started. Was it that night on a rooftop when they had a really bad fight – and neither of them remembered now what was that all about? When Leo pinned him down and won by a kiss? Well, not exactly won… but not lost either.
Or perhaps it had started a little earlier with this contest of stares and "not talking"?
Was it the Mating season? A full moon?  Fate?

Maybe Lao cared about deep reasons, Raph sure as shell didn't.
They've never properly talked about what was going on, partly afraid to scare it away, partly because neither of them wanted to pick up a fight.

At first they struggled for control in this just as they did in everything else, however when it came to blows the fight turned into a hot prelude. Now it was kind of a routine. No weapon sparring meant sex. Supply run together meant sex.

They kept it low in a silent agreement that this secret was theirs only. And they were
exploring.

Two weeks of unsure snuggling and kisses made them both head off for research. Leo borrowed an old biology textbook from Don, who immediately offered his tuting help. Leo turned the offer down and that earned him a dubious look from the genius. Leo tiptoed around Don ever since, certain that the brainiac had suspicions.

Raph took some time to gather his courage and ask Casey to get him certain magazines.
"Ain't ya too young for this, pal? I mean, what are you? 15?" Casey's concern was touchy, especially noting that he asked it when he was already handing the goods over.
"Gimme that!" Raph snatched the magazine from his pal's hands and flipped through it impatiently. Then he suddenly realized that his friend was studying him and stopped his frantic search.

He even forced himself to stay nonchalant and go along their roofs patrolling routine. However, occasional sideway glances that Casey shot him told him that he hadn't fooled anyone.

Not that he cared much.

That night they've met somewhat solemnly to share the trophies.  Unfortunately, both seemed of no use: their mutated bodies were too far from both species. They've tried some things. It was awkward.