Wildest dreams

Louis Tomlinson was the omega that most Envied, he had everything, power, fame and money. But he lacked an alpha, someone who'd hold him when times get hard, someone who'd whisper loving things to him but what he didn't expected was to fall in love with someone who he'd swore he'd never.

Or

The actor AU in which Louis is an omega and Harry an alpha, they costar each other in a movie "Wildest dreams" and things get shitty from there.