KK river situation 3-handed

[sy_or_bust]

This is what I've been agonizing over. Looking closely, MP3 cannot have a strong hand AND a good redraw when the A[img]/images/graemlins/club.gif[/img] is on board and the K[img]/images/graemlins/club.gif[/img] is in my hand. So his turn call and first river call means he holds AK or is an idiot, and both times he pays 2 more to show down.

Button's 3-bet is still really scary and completely out of nowhere (it is a mistake to assume I am always good here), but I'm pretty sure I misjudged the situation with MP3 and should have raised.

In similar situations I'm sure this is the right play, but not when holding such a strong hand with MP3 apparantly pot-committed - this is what I missed. If anyone still likes a call, please say so - I'm not an expert on fishy 3-bets and LAG river play.