How did Faye and Kratos fall in love?

Could you elaborate on the circumstances that led to Faye and Kratos' romantic involvement? Were there any specific events or shared experiences that sparked their attraction towards each other? Did they have a gradual build-up of feelings, or was it an instant connection? How did they navigate the challenges and obstacles that may have arisen in their relationship, if any? I'm curious to know the details behind their love story.