True story:
My dusky conure was a little stinker.
He and his mate had "evil-ed" their way out of four prior homes, before they wound up at mine. He was also one of the smartest little birds around... one of the few I've ever had that consistently spoke in context...
I caged those two at night, and while I was at work. (Cuz they were evil and could not be trusted.) And my Dusky used to be in full suck-up mode at bedtime, trying to get extra out time.
So he did his full on attention oriented thing, calling me over to the cage, giving me kisses, and I picked him up again. He did the full on displays, and games, and kissing noises, and affectionate behaviors in the palm of my hand. And he was a happy and super-affectionate little bird... (momentarily.)
Then I told him good night, and lowered him down toward his cage. THE MINUTE HE REALIZED THAT HE WAS GOING TO BED, HE GOT MAD AND QUITE LITERALLY PUT HIS BEAK ALL THE WAY THROUGH THE FLESHY PART OF MY FINGER... LENGTHWISE! LIKE TIP OF THE BEAK STICKING THROUGH THE OTHER END...
Needless to say, I was pissed... but so was he and he just threw a little birdy hissy fit. Never happened again. And like you, he was in suck-up mode afterwords. (I showed him my finger the next morning, and he actually verbally told me he was sorry! Where he picked that one up I don't know, but as evil as he could be, I assume he had practice.)
Bottom line, he didn't do it again, though he always had a bit of "stinker" in him. With the smart as a whip, and fun, also comes feisty... it's a given. A conure is basically a shrunken macaw! Same behaviors, smaller scale.
And it didn't require stitches, so he was still "pet quality."
He's the little green bird...
King of the world! Yeah, watch your fingers taking him out of the treat mix... "IT'S MINE!"
And he still had shoulder privileges even after that:
He beat up Py and stole his skateboard. That's how he learned to do this...
