re in an alternative universe where HL aren't together: literally just change Louis to Niall. "Is this song about your relationship with Niall Horan?", and Harry probably like "sure thing, he's the sweetest creature of them all *insert a smile or a laugh*. but, in all seriousness, i'm afraid it's not, no". Basically make an unoffensive joke out of it (not to ridicule the fans who might think that but also laugh at it because it's nowhere close to the truth).