Folding to a donkbet?

[Newman30]

What do you think about this hand/fold?

Villian is a decent player (25/19/3), capable of making moves.

When somebody bits into me I always (95% of the time) take it as a donk bet. When I have nothing I raise to make the opponent fold almost all of the time. This flop I am sure I have the hand, so I don't raise, because I don't want a fold. On the turn I still think I have the hand, although he could have made a lucky pair of kings, but it is unlikely.

Everest Poker No-Limit Hold'em, $2.00/$4.00 (HH Converter by Kreatief)

CO (360.00) (Hero)
Button (388.00)
SB (112.00)
BB (386.40)
MP3 (1,019.20)

Preflop: Hero is CO with Q[img]/images/graemlins/spade.gif[/img], A[img]/images/graemlins/spade.gif[/img]
<font color="#666666">1 folds</font>, <font color="#CC3333">Hero raises to $16.00</font>, <font color="#666666">1 folds</font>, SB calls $14.00, BB calls $12.00,

Flop: 7[img]/images/graemlins/diamond.gif[/img], 3[img]/images/graemlins/spade.gif[/img], Q[img]/images/graemlins/heart.gif[/img] ( $48 )
<font color="#666666">1 folds</font>, <font color="#CC3333">BB bets $35.00</font>, Hero calls $35.00,

Turn: K[img]/images/graemlins/diamond.gif[/img] ( $118 )
<font color="#CC3333">BB bets $100.00</font>, Hero calls $100.00,

River: 6[img]/images/graemlins/heart.gif[/img] ( $318 )
<font color="#CC3333">BB bets $235.40 and is all-in</font>, <font color="#666666">Hero folds</font>,