Disclaimer: I own literally nothing in this story.

AN: This is a though experiment, on my end. There will be mentions of cross-over, at least in small part. But they are only mentions. This is, at the moment, a one-shot because I have nothing better to do. Anyone who wants to use this? Feel free, just let me know and link me to the finished product.

Danny honestly had no clue when it happened. Seriously, he didn't. He'd been dating Sam for a few months after the Disasteroid incident, his identity was out and due to several laws passed (and some repealed like the Anti-Ecto act of 2012) he was protected from the Idiots in White. He'd managed to even get protection for his ghostly allies, even his enemies, from those morons. With his help, his parent's research into ecto-biology and physics was going superbly as well.

Yet something had felt... Off. Like something was missing. Like any High-school student, even one who was shot to the top of the food chain when his identity as the town hero was unveiled (Dash still could not believe he'd shoved his hero into a locker) he had his vices. He loved Video games, he enjoyed books of specific varieties, and now that he was actually allowed to do his normal thing without losing grades, though making up for 'time lost' after school was a pain, his grades had managed to get out of the shitter.

Not to mention the media coverage. And the new insurance policies enacted for the growing number of heroes in the world made his 'accidents' and 'property damage' much more manageable. For ten years his premiums were paid for by the office of the President of the United States. A thank you for saving everyone's lives. Where in the HELL was Superman when the Disasteroid had approached? He and the Justice league had been off rescuing Hal Jordan from some trumped up trial in another part of the Galaxy. When they got back? He actually got to shake hands with the Man of Steel himself! How cool is that? The Last Son of Krypton had even said that when he graduated, there'd be a seat waiting for him in the League!

But even through all of this? Something was missing. He'd done the 'soul searching' thing. As a Half-Ghost that was an amusing prospect to say the least. He'd even consulted with Doctor Fate. The Lord of Order had told him it was something he could not help with, and refused to say anything further on the matter. Still, for what the good Doctor had called 'a creature tainted by Chaos' he and Danny managed to get on well enough.

He'd asked his friends. Tucker had suggested maybe he should look for answers on the internet... Sam had smacked him hard for that one. She then suggested that maybe he should take a vacation.

He'd decided to do both, actually. As much as he might not trust the information found on the internet? He knew there was usually a kernel of truth to be found. And a vacation was a nice thing to take every now and again. He'd gone to Frostbite's realm, actually. The wise leader of the Far Frozen people was more helpful, but no less cryptic than other sources. He told Danny that he should probably examine his life one aspect at a time to find which one didn't quite fit the puzzle. Ghostwriter was helpful, at least. He gave Danny a LOT of books to read on the subject, but none of them were particularly concrete, since Danny didn't know what the problem was to begin with. Just a vague feeling.

Clockwork was the most helpful, ultimately. Even if he didn't actually tell Danny anything, the Ghost of Time had become like a mentor to the young Halfa. Granted an aloof mentor who let his student figure things out as he went rather than give any kind of answers, he just asked Danny questions to get Danny thinking, really. And that's apparently all it took to get on track.

Perhaps it was when he kissed Sam the first time. The fake-out make-out was... Nice? Like any boy, the feeling of a girl's lips on his was a good one. There was also the many times he and Sam had shared that brought their not-so-well-hidden feelings to the fore. But something was off with them.

She was controlling. She was demanding, finicky and very... VERY stubborn. If you didn't agree with her, you were 'provably' wrong. No matter what they were talking about? He could never win any points. Not for lack of trying, mind you. But he just could not win. At all. Diet? 'Ultra-recyclo-vegetarianism is the only way to go.' Dress style? 'Alternative.' Music? 'Dark and moody.'

It was a constant struggle just to keep himself above water in the sea of her demands. She was a good friend, mind you, but as a girlfriend? She was high maintenance at the best of times. Impossible to please at the worst. Danny was very laid back when he wasn't fighting for his life. He just wanted to relax and watch the stars. The small lights burning light years away always called to him, like memories locked away in time.

The breakup hadn't gone as badly as he'd feared. Sam was understanding, and agreed they worked better as friends. They both agreed there was a physical attraction, and their personalities did mesh well at times, but both had their own desires in a partner, and neither of them really fit those fully.

Granted all of this was helped along by Tucker being there with his input and Jazz, being home from college on break. Hey, they were still teenagers, and the call of teenage drama was ever present. It's not like he was breaking up with her to chase after Paulina, after all. THAT was made perfectly clear.

With that taken care of, he felt like some of the weight had been lifted from his shoulders. He'd taken a flight around the town to clear his head and get everything in order. The only complication was the Box Ghost coming along and doing what he always did. Make a nuisance of himself. A quick fight and a full Fenton Thermos later, Danny returned to his home intent on taking a shower.

When he opened the door, the first thing he noticed was that he hadn't heard the water running. Then legs. Gorgeous, smooth legs that looked like they went on for miles. Connected to them were hips that any man would kill to hold on to... And then he realized it. This was his sister.

Part of him, the rational part, revolted at the thought. Millions of years of evolution had taught humanity something called 'reverse imprinting' which made it so that those one spends their formative years around are 'off limits' to biological processes one usually encounters during and after puberty. It was sick, wrong and disgusting.

Another part of him, perhaps part of him that was around before his change, perhaps not, simply continued looking up the body. Stomach, taught and well-formed. Breasts, nicely sized with pink nipples perked up in the spray of the shower and dripping wet. Red hair, a weakness he'd never thought he had until this moment...

With a slam of the door, he shouted "SORRY!" before catching his breath and trying in vain to calm himself down. He'd noticed his jeans were uncomfortably tight, but he tried desperately to focus on anything but the image he'd just seen...

So when was it, precisely, that things had turned out like this? He couldn't help but ask himself that as he looked over the large bed his apartment sported at the beautiful redhead sleeping beside him. When, exactly, had they both discarded the morals of society and ignored the centuries of evidence that this should not happen? When, exactly, had Danny Fenton and Jazz Fenton decided to move from a brother and sister relationship to lovers?

He had no fucking clue. But he wouldn't change it. Not for the world.