My bird won’t stop biting my nipple.

Idk if I should have this as nsfw since it’s just my nipple, but omg. I know, laugh it up, it’s funny.

It was funny the first few times, but now I’m starting to genuinely have issues with my nipple because of my bird. I have a conure who is around 2 years old. He’s a pineapple green cheek, and I’m not going to lie… he’s a dick.
He rubs his face into my shirt and bites my nipple as hard as he can and latches on like a little decorative piercing. It’s gotten to a point where that is all he will aim for as he knows where it is now like some freaked out spider-senses.

What do I do. I’ve put him in timeout several times, told him no, and tried most things. Any ideas on what I can try to get him to stop?😭