Laydown KK to A-high flop hand history: Raise more PF and a bad call?

[Unarmed]

Fold the flop.
MP2 may have an ace or he may have two hearts.
It really doesn't matter because your hand isn't strong enough to withstand a semi-bluff all-in by MP2 if you raise for "information".

Calling is bad because it screams that you don't have an ace, and now MP2 can make a real bet on the turn knowing you can't call.