One possible plot could be that Naruto, with his never - give - up attitude, somehow gets transported to Salem's world. He might initially be seen as a threat but then uses his ninja skills to help the people there. Maybe he tries to find a way to bring peace between different factions in Salem's world, just like he did in his own ninja world.
Well, perhaps in this fanfiction, Salem is intrigued by Naruto's chakra. Naruto, on the other hand, sees Salem as a powerful being who could be redeemed. So he tries to show her the value of life and friendship. He could start by helping the people who are oppressed under Salem's rule and gradually make her understand the concept of co - existence.