AA, slightly passive player bets into me

[DontRaisePlz]

PokerStars 1/2 Hold'em (9 handed) converter

Preflop: Hero is MP3 with A[img]/images/graemlins/heart.gif[/img], A[img]/images/graemlins/club.gif[/img].
UTG calls, <font color="#666666">2 folds</font>, MP2 calls, <font color="#CC3333">Hero raises</font>, <font color="#666666">3 folds</font>, BB calls, UTG calls, MP2 calls.

Flop: (8.50 SB) K[img]/images/graemlins/diamond.gif[/img], K[img]/images/graemlins/spade.gif[/img], 8[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(4 players)</font>
BB checks, UTG checks, <font color="#CC3333">MP2 bets</font>, Hero calls, BB folds, UTG folds.

Turn: (5.25 BB) 8[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">MP2 bets</font>, Hero???

Did I even play correctly on the flop? I figured 4-flushes are calling anyway, kings may 3-bet me, a raise might scare out hands like 66/77 or an 8 from calling, and there are no other draws. Only problem is I did not define my hand, he may bet diamonds or 99 into me.