[JFM] 12.5 Forbidden - Have sex with someone you shouldn't have

[ooc: Sylar/Gabriel is heroslayer and used with permission and by request. Any mistakes in characterization are mine alone. Set 500 years in the future in Firefly/Serenity/dontrightly_die 'verse immediately after the Unification War]

Fear not what you can't see
The pulse
The pain
The ecstasy
A hollow space
An empty grave
The best laid plans are meant to fade - "Yohoho" - KMFDM

They danced around it for centuries with a lingering curiosity of what might have been, in another place, another time, if they'd met on a different ground or playing field, before their hearts had been otherwise claimed and their darker instincts curbed in a spirit of self-preservation if nothing else. What if it had been one brother instead of the other in the cell on the other side of the wall? How might the world have changed? How might they have? The man who liked to hurt, and the man he couldn't kill, who welcomed the pain as a reminder he was alive. But it remained just that--a dance they engaged in now and then when darker moments hit. A glance of understanding when fury sparked in the other; a commiserating look at something particularly naive that came out of Peter or Mohinder's mouth; a meeting they told no one about to wreak a bloody vengeance on someone who did something to piss one of them off. Those were the moments the speculation flared highest, at least in Adam's mind, because for all that he'd never had someone like Peter who stayed by his side, he'd never had the opportunity to have someone like Sylar either, and gods but what a pair they could make. The world would tremble in fear before them, and no one would stand in their way. He could feel it in the air, the hot thickness of the idea of it, pressing in against all those restraints he'd erected around himself to keep the things in his life that he'd convinced himself he needed.

( It should have broken in an alley drenched in blood, some unworthy on the ground beneath their feet. )