Hawaii Five-0 is property of CBS and its creators.

A/N: Inspired by pterawaters' excursions into soulmate verses over on AO3.

Everyone has a soulmate, but not everyone finds theirs. In fact, most people don't. In theory, their soulmate should be someone they'd meet during their life, but in reality there's too many variables, too many threads, too much free will for Fate to keep track of.

Steve McGarrett thought he'd met his soulmate in the Navy. Her name was Catherine Rollins. She was everything Steve could possibly hope for. She was beautiful, smart, ambitious, and devoted to the Navy. He was a SEAL, she was in Intelligence, until eventually he transferred to Intelligence as well.

There was something missing, though. Steve was happy, he was comfortable, he was even in love, but he knew deep down she wasn't his soulmate. By all rights, she should be his soulmate; he couldn't imagine anyone more perfect for him, but he knew she wasn't. There wasn't that spark, that certainty, that electricity he'd heard about from people who'd found their soulmate. They didn't feel like one person; he could tell where he ended and Catherine began. She wasn't someone he couldn't imagine being without; he could. He didn't want to, but he could. He could see himself spending the rest of his life with Catherine, but he couldn't bring himself to marry her, to take that final step and join them together until death do them part. That was for his soulmate, and that wasn't Catherine.

When Steve met his soulmate, he didn't realize it at first. It wasn't love at first sight. There wasn't this instant flash of knowing. He didn't look at his soulmate and see the person he was destined to spend the rest of his life with. He saw a short, blond cop, dressed completely inappropriately in a dress shirt, dress slacks, and a tie, for heaven's sake, pointing a gun at him across his father's garage. He saw someone who refused to be bullied (Steve would call it refusing to listen to reason). He saw someone who drove him to do something he'd just turned down—accept the offer to lead the Governor's task force.

Steve wanted to dismiss the man (Danny Williams, he learned), but he couldn't. It wasn't that he couldn't get the man out of his mind, was haunted by those icy blue eyes, pictured his muscled body naked beneath him (well, okay, maybe he did. Except the last one. Okay, maybe the last one, too). It was because Danny was the one most likely to hold the clues to solving John McGarrett's murder. So Steve showed up at Danny's the next day, intending to ask him, reasonably, to be his partner. Instead, he ended up shanghaiing the man, bitching all the while, and practically forcing him to be his partner.

The man couldn't stop complaining, hands waving energetically, about being conscripted, about the case, and then veering completely off course to complain about being a haole, all the things he hated about Hawaii, and about his ex-wife. Steve learned more about Danny in that first hour than he'd told Catherine about himself in the first year. He just wanted Danny to shut up already, and yet he wanted the cop to go on talking forever just so he could hear his voice.

Then they tracked down their lead and things went sideways. Bullets started flying. When they stopped, their only lead was dead, and Danny was bleeding from a graze on his arm. Danny started yelling at Steve for getting him shot and needing to apologize. Steve barked at him, expecting Danny to shut up and fall into line. Instead, Steve found himself the recipient of a right hook to the jaw.

It should have hurt like a son-of-a-bitch. He should have been furious at Danny, and to outward appearances he was, putting Danny in a wrist lock until he relented. But it didn't, and he wasn't. Instead, when Danny's fist connected with his jaw, Steve felt an intense euphoria he'd never felt without an orgasm, and maybe even then. He felt a spark he'd never felt before. He felt complete, like he'd found the missing piece of himself. He felt like he'd come home, not to Hawaii, not to his father, not to his past, but to this man. In that second, he knew.

Danny Williams was his soulmate.

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A/N: My apologies for departing from my main series, but this little plot bunny wouldn't let go. :) I'll get back to the others soon!