Luna I believe is a teenager now. She's become much more wild, she now has an iris ring and bent through a molt.
But she's biting, and hard! She will come to my finger on her own, and eat her treats. But after she is finished she starts exploring my fingers and begins to bite really hard as if she is testing everything out.
I've tried not reacting but she has actually drawn blood on occasion. I don't think she is angry or trying to be mean, it looks to me as if she is playing or testing and just biting really hard. I've tried blowing on her but she doesn't seem to care unless I blow really hard and then she will stop for a second. If I try gently rolling my hand back and forth she just gets excited and continues to do it harder.
My sweet bird has been doing this same things lately. I don't think she means to hurt me, she just likes to bite things and gets excited. Sometimes telling her in a calm voice to be gentle helps. Then if she only nibbles, I praise her a lot for being gentle.
It can be hard to keep your fingers out of the way if your bird is out of the cage. I have at times hidden my hands under a blanket because she will seek them out. This is a problem when I am supposed to be typing!
One other idea is to pay attention if there is a particular thing that makes it more likely she will come bite. Are you always doing the same thing? Does she get excited by something before she goes on a biting spree? This may help you come up with ways to distract or calm her.