:grunch:

MP2 limp/caps preflop putting his range to about AA or KK assuming he isn't annoyed and going crazy.

You have to raise him on the flop, just to see if he was telling the truth preflop.

The turn raise is a little iffy because MP2 doesn't slow down and you are only ahead if he has KK and not AA.

I would almost fold on the river because you are losing to his limp/cap preflop range. I would only call if I thought he was tilting.