Donatello worked at a psych ward, his main job was to keep an eye on the patients and make sure they weren't harming themselves or causing issues. He spent most of his time talking to the patients because he found it interesting, their stories were quite fascinating.

One day Donnie got assigned a new patient, you. He didn't see it as anything but a new person to tell stories and stuff, he was led to your padded room and he walked inside and saw you