NL$200| KK faces donk-all-in on flop?!

[Acevader]

Villain is 30/18/5.3 after a limited 93 sample. I've no notes on him and haven't seen him get out of line yet or make big over-bets, etc. Thoughts on this fold?

Full Tilt Poker, $1/$2 NL Hold'em Cash Game, 9 Players
LeggoPoker.com - Hand History Converter

Hero (MP2): $200
CO: $193
BTN: $207.05
SB: $467.85
BB: $334.10
UTG: $60.25
UTG+1: $106.45
UTG+2: $199.65
MP1: $97.55

Pre-Flop: K[img]/images/graemlins/diamond.gif[/img] K[img]/images/graemlins/club.gif[/img] dealt to Hero (MP2)
3 folds, MP1 calls $2, <font color="red">Hero raises to $12</font>, 2 folds, SB calls $11, 2 folds

Flop: ($28) 6[img]/images/graemlins/spade.gif[/img] 2[img]/images/graemlins/diamond.gif[/img] 9[img]/images/graemlins/club.gif[/img] (2 Players)
<font color="red">SB bets $154</font>

Results: $28 Pot ($1.40 Rake)
SB mucked and WON $26.60 (+$14.60 NET)