99 overpair OOP vs donk, 3 flush flop & min raised

[DirteAA]

Villain is about 67/15/5 over 300 hands.

Best way to proceed?

Full Tilt Poker
$1/$2 No Limit Hold'em Ring Game
5 Players
LegoPoker Hand Converter

<font color="black">Stack Sizes</font>
UTG: $198
MP: $36.20
CO: $257.35
BTN: $85.55
Hero (SB): $252.5

<font color="black">Preflop:</font> 9[img]/images/graemlins/heart.gif[/img] 9[img]/images/graemlins/club.gif[/img] ($3, 5 players)
MP folds, CO calls $2, BTN folds, <font color="red">Hero raises to $10</font>, UTG folds, CO calls $8

<font color="black">Flop:</font> 4[img]/images/graemlins/diamond.gif[/img] 8[img]/images/graemlins/diamond.gif[/img] 3[img]/images/graemlins/diamond.gif[/img] ($22, 2 players)
<font color="red">Hero bets $18</font>, <font color="red">CO raises to $36</font>, Hero

[Arito]

Fold. What is there to think about? You can find a better spot against this player than this.