Thomas and Ellie were the same age, and they grew up some distance away, but they were a lot the same. They both wet the bed and wore pinned cloth nappies/diapers and plastic pants. The entered high school still wetting the bed, sleeping with a pacifier and stuffed toys. They never grew out of it as most do.
They met at university and developed an unusual and unlikely friendship. They were not a romantic relationship. Rather, they were friends - baby friends.
They were... Two Of A Kind.