NL25 check behind as PFA 3 suited board?

[stever1k]

PokerStars No-Limit Hold'em, $0.25 BB (6 handed) Poker Stars Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

MP ($23.65)
CO ($23.70)
Hero ($25)
SB ($21.15)
BB ($35.15)
UTG ($22.90)

Preflop: Hero is Button with K[img]/images/graemlins/diamond.gif[/img], A[img]/images/graemlins/spade.gif[/img].
UTG calls $0.25, <font color="#666666">2 folds</font>, <font color="#CC3333">Hero raises to $1.25</font>, SB calls $1.15, <font color="#666666">1 fold</font>, UTG calls $1.

Flop: ($4) T[img]/images/graemlins/heart.gif[/img], 9[img]/images/graemlins/heart.gif[/img], 3[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(3 players)</font>
SB checks, UTG checks, Hero checks.

Turn: ($4) K[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">SB bets $2.75</font>, UTG folds, <font color="#CC3333">Hero raises to $7.5</font>, SB calls $4.75.

River: ($19) Q[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
SB checks, Hero checks.

Final Pot: $19

So, should I contibet on flops like this?

On the turn I first though, okay I'll crush this K7o, but a flush / set would maybe also play like this.