Well, it's been a while since I read that part. But I think it was due to some unexpected zombie attack or a risky situation they couldn't escape from. You could check online forums or discussion groups for more accurate and detailed explanations.
Their relationship could start off rocky. Enid is used to a world of distrust, while Naruto is more open. But as they face challenges together, like fighting off walkers or finding shelter, they'd start to trust each other. Naruto's positive energy would gradually break down Enid's walls.
A Naruto x Enid 'The Walking Dead' fanfiction could be full of action and character development. Naruto's optimism would be a shock to Enid who has seen so much despair. He might help her open up more. For example, Naruto could use his shadow clone jutsu to distract walkers while Enid scavenges for supplies. And Enid could teach Naruto about the unwritten rules of survival in her world. Their relationship could grow from comrades in arms to something deeper as they face the constant threat of walkers and other survivors together.
Some fanfictions also focus on their individual growth within the relationship. For example, Henry might learn to be more assertive from Enid, and Enid might learn to trust more from Henry. This mutual growth is an interesting aspect that many fanfiction writers like to explore.