Oh yeah, there's no doubt, the boy is in love!

The regurgitation is a sure sign of that. You should be flattered. Try not to make a big deal out of it though. Ideally, your relationship with him should be as a friend, not be as his "mate". Us humans make lousy parrot mates.
Baby is a parrot. Chewing on
everything is normal. They explore their world through their beaks. That's not to say its something you want to allow. If the gentle chewing turns too rough, you need to let him know, with a calm "no", or "no bite", or "easy". Something like that. Don't yell or sound excited, since to a parrot, that's a huge reward. They love to provoke a dramatic reaction, and this even has a name, the Drama Reward. Let him know its unacceptable, and divert his attention with a small toy, or even a perch or something that he
is allowed to bite on.
I would recommend you start working on rules and manners right away. Be careful with allowing him on your shoulder, for a couple of reasons. This is particularly important if he's becoming protective of you. There is something called "Transference Aggression" whereby if they are on you and someone else comes near, and they can't get at that person, they may bite you. Its not personal, and its not being mean, its just what a parrot would do in the wild to try to drive their mate away from a perceived threat. They can't understand why you don't flee, and they try to make you do it. When the parrot is on your shoulder, it has easy access to some very soft and vulnerable bits (for instance, ears, nose, eyes, lips) and they can move very fast. Another reason to avoid shoulders is that if the parrot decides he doesn't want to leave your shoulder right now, he can make it difficult for you to remove him, because he can be hard to reach. Also, again, he has access to those ears if he gets miffed about you wanting him down. Some parrots are fine on the shoulder, some not. In any case, if you want to allow it, it should be an earned privilege, and not allowed if there are issues. I allow Quito pretty much free access to me, and she spends a lot of time on my shoulder or hanging off my shirt. I insist on her stepping up if she starts getting too cheeky though. Even so, there's a good chance I'll pay the price with a bloody ear or something someday.
I know its very flattering that he has chosen you, but if you want the rest of the family to be able to handle him you need to start working on that now. For this to work, they need to handle him a lot too, and they need to want to. You may have to leave the room while they do this for a while until he gets used to it. They should not attempt to remove him from you, that's just asking for trouble. You should reach a point where you can "hand him off" to them however. Does he understand and perform "step up"? If not, step up training is invaluable.
Congratulations, you've made huge progress! He's accepted you and decided you are wonderful. That is pretty darned cool, and a thrill that a lot of people never experience.