Emotional Manipulation

How are children so clever ? Is it learned or inate ?

Today, after C. threw a cardboard box out the window ( "oh dear!" ) for the 3rd time, I refused to join in his chorus of shock and disappointment.

I said "no, that's naughty, it's not "oh dear", you did it on purpose"
He gives me a big joyous wave and says "seeya!". I do not return wave.
He tries to High-Five me. I ignore the offer.
He tries to 'make' my hand High-Five him - it remains fast.

Then the clincher - a puckered up mouth beseaching me with kissy/smoochy noises.
I turn away, now silently laughing, my hitching shoulders the dead-giveaway. He tries to turn my head to face him - still with the kissy noises and adorable fishface. I continue to resist. He now has me by the chin and makes me face him.

I can't resist, I kiss him.

Used, he drops me like a hot scone. "Seeya" he says, reverting to the initial cheerful 'I do no wrong' happy face.

I am laughing, I will regret this manipulation at a later date, but I am so under his thumb.
I recover enough to issue stern finger-wagging request that he go outside and pick up the boxes.

"Seeya!" says happyface, with a joyous wave. Hmmm...