Sometimes, everything just clicks together suddenly.
Of course there is not need for interaction rules when trying to capture the storytelling of fighting games with an RPG. That’s what combat rules are for.
You need to win a new friend or ally? Beat them in an honest duel.
You wish to haggle at the bazar? Fight against the trader’s giant eunuch guard.
You want to confess your feeling to your one true love? … right after the sparring match.
Social Combat. Literally.