10NL: What do i do on the flop? rr pot

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I 3bet pf cause CO is pretty aggro 36/18/2.38 over 89 hands, hoping to pick up the pot pf.
Now on the flop i dont rlly know what to do.
Do i bet/push or do i check/fold?
Or maybe i should just call pf?
We're both full stack.

Prima Poker skin
No Limit Holdem Ring game
Blinds: $0.05/$0.10
6 players
Converter

Pre-flop: (6 players) Hero is BB with 9[img]/images/graemlins/spade.gif[/img] 9[img]/images/graemlins/club.gif[/img]
2 folds, <font color="#cc0000">CO raises to $0.4</font>, Button calls, SB folds, <font color="#cc0000">Hero raises to $2.1</font>, CO calls, Button folds.

Flop: A[img]/images/graemlins/club.gif[/img] 3[img]/images/graemlins/club.gif[/img] 2[img]/images/graemlins/club.gif[/img] ($4.75, 2 players)
Hero ??