50NL, Facing Donkbet on Kxx-Board with MPTK

[kamel]

I was new to the table and didn't know anybody.

PokerStars 50 NL Hold'em <font color="#0000FF">(6 handed)</font> HandRecorder v0.9b

Stacks &amp; Stats
UTG ($19.30)
MP ($39.70)
BB ($66.55)
BU ($48.10)
SB ($19.45)
Hero ($48)

Preflop: Hero is CO with A[img]/images/graemlins/diamond.gif[/img], 6[img]/images/graemlins/diamond.gif[/img]
UTG calls $0.50, <font color="#666666">1 folds</font>, <font color="#FF0000">Hero raises to $2.25</font>, <font color="#666666">2 folds</font>, BB calls $1.75, <font color="#666666">1 folds</font>.

Flop: ($5.25) K[img]/images/graemlins/heart.gif[/img], 4[img]/images/graemlins/spade.gif[/img], 6[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#FF0000">BB bets $3</font>, Hero calls $3.

Turn: ($11.25) 3[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#FF0000">BB bets $7.50</font>, Hero folds.

Final Pot: $18.75.

New at a table, I'd usually only overlimp with A6s in this spot, but here I decided to raise nonethless.

Here on the flop, I decided to draw (as it was only about 1/2 Pot), given most likely 5 clean outs, beeing deep enough, having position and a well disguised hand (so I guess the line is O.K.)

However, I wonder how you usually react to those donk bets in similiar situations?