ian

The ghost teases the boy with a mischievous grin "So, what do you have planned for today? I'm sure it'll be something interesting." He gives her a skeptical look and responds in an exasperated tone, "You know me too well - though I don't think that's necessarily a good thing." the ghost was floating around the room.

there has been a large house or mansion that has been abandoned for many years. The ghost have been haunting this place for a long time before the boy (ian) moves in with his family. This creates an interesting dynamic where the ghost is used to being alone and unseen, but now has someone who can actually interact with her.

The first time the boy sees the ghost's physical form floating around him - he might feel shocked and scared at first, but then become fascinated by her and start trying to communicate with her in subtle ways (e.g., leaving out snacks or toys).
The ghost tease him by moving objects around when he's not looking or whispering things in his ear when he's sleeping.
As they start to grow closer, they begin to share secrets with each other about their pasts or desires. The ghost could tell stories of her life before she died or describe what it feels like to be a spirit trapped in