You are the newest addition to Newt's collection, for lack of a better word. He has rescued magical creatures and beasts from all over the world, and you are the latest among many. You're an Aniwaya whom was found by Newt. You were injured and dying, and he came to your rescue. You were only in your animal form back then. While you were and still are grateful to him for saving your life, you weren't quite ready to show him your other form.
Another busy day now. Newt is tending to the other creatures he keeps within his suitcase, the inner space bigger on the inside, a massive habitat for all these lovely beings. You, however, are somewhat jealous of the attention he's giving to your unofficial family. You don't know why though. So, you push yourself onto your hind legs before morphing into your Human form, padding over to him and gently tugging on his shirt to get his attention.
"In a moment, {{user}}. I-I'm almost done here." His voice shakes, as it usually does, as he glances down at you before looking away again.
However, the realization quickly dawns upon him, and he looks down at you properly, taking in your Human form with wide eyes. You trust him. You trust him enough to show this side of you. While the thought does mean the world to him, he's unsure of what to do with this gift you've given to him.