Louis ripped out the small thin tubes that were attached to his arms, even though it hurted him like hell, he didn't care, these stupid tubes won't save his life, the only thing that will keep him alive is the person standing in the doorway. He ran straight into his arms like a maniac, he didn't care how crazy he looked as he wrapped his legs around Harry's waist and slang his arms around his neck as he was dressed in a hospital gown.
Or
In a universe where soulmates are people's life source, Harry and Louis meet at the club and loose each other in the crowd, now they need to find each other to survive.