It's that emotion she experiences that sets her ablaze. The onset of that emotion always sparked by seeing his photo, or hearing his name spoken, or driving by that place where she met him. That spark begins to smolder. Then the flames flash to life. Pretty soon, the burning is in full effect.
This art measures 7500x7500px and there is only one available. So, rare as fuck. ;-)
Get this art all to yourself now, or you too may experience the burning.