Love On Air (Larry Stylinson)

Louis loves music. He loves to listen to music, to promote musicians on his radio show, and more than anything, he loves to talk about music. What he hadn't expected was to be sitting trapped, on air, in his studio with a stranger who it turns out is just as passionate about music as Louis is.

Or the one where Louis doesn't have a type, no matter what Niall says, but if he did, it'd probably be the guy currently trapped in his radio studio and grinning back at him from across the desk.