You're Not Broken, Just Unfinished

Lance, brother of now-Queen Allura, prince of the somehow-still-standing Altea, had never actually put too much thought into how or who or why he'd fall in love with someone. Despite having a reputation for being a flirt, he'd never thought of when he'd find The One (those words, with what they mean, needed to be capitalized).

But when Allura decides to put forth the effort to be sympathetic to Galran slaves, saved and brought forth by their ally Lotor, Lance doesn't need much more time or prodding to finding The One Whom He'll Love the Most Forever.

Problem is, one of the ex-slaves, badass, beautiful, sweet Keith is pretty damaged. Answer? Easy: Lance.