Honestly, the pairing scene for Les Twins fanfic is pretty sparse compared to something like 'Harry Potter' or even other dance-centric fandoms. Most of what I've stumbled across is Laurent x Michael, which... feels kinda inevitable? But it's never really framed as a traditional ship, you know? It's more about the intensity of their connection as brothers and artistic partners. I've seen a handful that explore that codependent, almost psychic bond they have, blurring the lines between platonic soulmates and something more. It's less romance and more intense emotional and psychological exploration.
There's occasionally a story where one of them gets paired with a dancer from 'The Royal Family' or with a female OC, but those tend to fizzle out quickly. The core fascination, at least in the writing I've clicked on, is the unique, closed-loop dynamic between the two of them. Anything outside of that seems to lose the specific tension that draws people in. The few attempts at crossover stuff, like with the 'Step Up' universe, never really took off either.