Their relationship could develop through mutual survival. As they face the dangerous animatronics together, they start to trust each other. For example, Gregory might save Vanessa from an animatronic attack, and she in turn helps him find a safe place to hide. This back - and - forth of helping each other builds a bond. Also, as they share their knowledge about the mall and the animatronics, they understand each other better.
One plot idea could be that Vanessa discovers Gregory is not just an ordinary child in the mall. She realizes he has some special connection to the animatronics or the secrets of the place. Maybe Gregory is the key to unlocking a mystery that has been hidden for years. For example, he could be related to the original creator of the animatronics in some way. Another idea is that Vanessa tries to protect Gregory from the more malicious animatronics while also trying to figure out his true identity. They could form an unlikely alliance and start to trust each other as they face the various threats in the mall together.
Communication is key. They can start by sharing their fears and hopes. For instance, Gregory can talk about his loneliness before coming to this place, and Vanessa can share her own struggles with her job. This mutual understanding will bring them closer.
Definitely not a true story. FNAF is a work of fiction that takes place in a fictional world with its own set of rules and scenarios. It's all about creating a thrilling and immersive gaming and storytelling experience, not reflecting reality.