It is something like Marcus and Cradoc in EOT9, only if Marcus and Cradoc had been really close friends with instant kinship and Marcus had a Really Obvious Crush (at the very least), rather than the hidden wariness Cradoc shows from the beginning because he already knows things about going to go south.

A & C have the potential to live happily ever after, certainly, and we know A must live long enough to produce descendants to pass the dolphin ring onto for later books.