Calum and Ashton live in a world of only dominants and submissives.
Ashton applies for a submissive hoping to get someone he can spend the rest of his life with.
Calum applies for a dominant hoping that he's not compatible with anyone.
They get paired together but Ashton knows Calum is hiding something from by the way the sub shies away from any sexual contact except kissing.
Calum does have a secret but if he tells anyone they would think he's a bad submissive for being asexual.
-*story idea by PizzaPartymgc *-