Getting mini raised on the flop with a vulnerable hand

[HoldEmNewby]

Villain is unknown. Is 3betting this flop the standard line?

Party Poker, $0.50/$1 NL Hold'em Cash Game, 5 Players
LeggoPoker.com - Hand History Converter

SB: $124.92
BB: $115.42
UTG: $22
Hero (CO): $118.58
BTN: $99.15

Pre-Flop: 9[img]/images/graemlins/spade.gif[/img] 9[img]/images/graemlins/diamond.gif[/img] dealt to Hero (CO)
UTG folds, <font color="red">Hero raises to $4</font>, BTN calls $4, 2 folds

Flop: ($9.50) 5[img]/images/graemlins/diamond.gif[/img] 3[img]/images/graemlins/heart.gif[/img] 6[img]/images/graemlins/club.gif[/img] (2 Players)
<font color="red">Hero bets $8</font>, <font color="red">BTN raises to $16</font>, Hero????