Hi! I hope you're doing well too, anon! I've made up a whole story about them in my head, but basically:
Naib is a graffiti artist, and Norton is a romance book author who is experiencing writer's block!
Norton, looking for a means to get rid of writer's block, decides to take a stroll through the city one night and comes across one of Naib's many artworks spread throughout. The graffiti motivates him, so he creates short pieces of every graffiti he encounters and publishes them, catching Naib's attention.
It's basically them inspiring each other and developing feelings, because what's more romantic than an artist choosing you as their muse? I HOPE THAT WASNT TOO CONFUSING TO READ I USED A TRANSLATOR HAHAHA