Truebonds (Larry Stylinson)
6 parts Complete MatureLouis doesn't mind being an omega, most of the time. Modern medicine allows him to suppress almost all of his omega traits, but the one thing it can't suppress is his scenting cycle. Fortunately, that only needs to be dealt with every seven years and he counts himself lucky that he can afford the services of a reputable agency.
With his cycle due, he reviews the matched candidates and there's one alpha who fits all of his criteria, S28A. That's pretty much where things start to unravel.
Enter Harry Styles, scenter for hire.
Or the one where Louis is an omega in need, Harry is an alpha for hire, and destiny presents them with a fate they never saw coming.