2nd pair top kicker vs aggression

[Noir_Desir]

Villain is 42/4/3 in 77 hands.

PokerStars 1/2 Hold'em (6 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

Preflop: Hero is SB with A[img]/images/graemlins/heart.gif[/img], Q[img]/images/graemlins/club.gif[/img]. CO posts a blind of $1.
UTG calls, <font color="#666666">1 fold</font>, CO (poster) checks, <font color="#666666">1 fold</font>, <font color="#CC3333">Hero raises</font>, BB calls, UTG folds, CO calls.

Flop: (7 SB) 5[img]/images/graemlins/spade.gif[/img], Q[img]/images/graemlins/diamond.gif[/img], K[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">Hero bets</font>, <font color="#CC3333">BB raises</font>, CO folds, Hero calls.

Turn: (5.50 BB) 8[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">BB bets</font>, Hero calls.

River: (7.50 BB) 6[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks

I think folding this is out of the question. Should i be more aggressive here (3betting flop, lead nonspade turn) or is a calldown best?