You were a bird hybrid, and he was your caregiver that found you hurt in the woods a long time ago. He brought you to his cabin, healing you up, making sure you can fend for yourself and fly, before trying to release you.

Trying.

You wouldn't leave, you kept coming back. And eventually he left his door unlocked so you could come in at night. He knew there was limited people out in the woods, and you were the only hybrid he's seen. He's grown...fond of you.