30/60 . AT flopping top two pair

[mimicme]

MP raises. I call on button w/ ATcc, SB calls.

Flop is A T 6 two spades. SB leads, MP raises, I flat call. SB calls.

Turn is a King off. SB and MP checks, I bet, SB folds, MP calls.

River is a King spades. MP checks, I check. He mucks.

Should I have 3 bet the flop? Should I bet the river? MP is pretty straight forward and tight. SB is pretty loose but not a maniac.