Any taming suggestions?

[Coral52]

^^ Hiya! Today, I toke my budgies out of their cage to clean it, and after I was done, I came back to see them perched on top of my desktop. I raised my finger near their feet and my young, yellow parakeet hopped on (the green one follows). After that, I gave them both a bath in the sink and let them dry off on my bed. I decided I wanted to try if they let me pet them.

Green Keet : He lets me rub his belly and occasionally his neck, but most of the time he waddles away or turns around.

Yellow : When I try to pet his belly, his foot always go up as if to try to grab my finger. I'm not sure if it's because it thinks I'm telling it to get on my finger or if he's doing it on purpose to shoo me. :/ So, no luck here. I tried to pet him from the back, but he always keep his eyes on my fingers (if I try too hard, he flies away)

Anyways, they're okay with getting on my finger, but they prefer each other more. They don't mind sitting on my finger for a long time or eating out of my hand, but they are always cautious of me and most of the time, do not turn their backs on me. I know it's because of trust, but am I doing it right? If I keep letting them out sitting on my finger, trying to pet them, letting them eat from my hands, will they someday be friendly? Or should I buy separate cages to tamed them alone (which is kind of a problem, since the green one is more of a 'flock' bird and gets depressed if he is not with his species)?

Oh, and another thing : when I first bought them, their bites doesn't hurt that much. Now, it hurts a lot (but not bleeding) and kind of tears a tiny layer of my skin. :/ They don't have an overgrown beak, and they refuse the cuttle bone. What do I do about their bites? (once, it left a mark on my finger that stayed for weeks) Well...my yellow and green budgie aren't very 'adventurous' or 'curious' like the other ones that people described. They are scared of a blue string, a spoon, and alotta stuff. Why is this? I thought they were suppose to be curious and wants to explore new things? Or am I suppose to introduce the toys first? If so, how? I tried playing infront of them, trying to 'tempt' them and let them see how much fun I was having, but no luck. XD Sorry for asking so much...Thanks!

[FlyingCircus808]

A lot of birds simply don't like to be petted on the back. A gentle head-rub may be better-received. Give them some time to get to know you. They will bite to defend themselves if they feel they have no other choice.