Free showdown play with middle pair from the BB

[SlantNGo]

SB thus far seems to be weak-tight, although not a rock. After ~100 hands, he's about 18/5. We've had one previous encounter, where he open-limped A4 from the SB, Bet/Called a 653 flop (I had hit top pair), Check/Called a turn Q, and Checked the river (I checked behind).

So I know he'll lead out with a draw, I think he'll lead out with 2 overcards (probably not raising pre-flop with just one OC seeing as he open-limped A4 once), and I think he'll lead out with a lower PP as well.

My first instinct was to raise the flop (my default play). I waited for the turn because I felt he would lead out with a draw and 2 OCs here again (am I wrong to think that even a weak-tight player would do this?). This allows me to extract value from the draw on a safe turn card, and extract one more bet out of a lower PP. Also, I think he will fold to my raise a reasonable amount of the time, although the only hand I can think of that I'd push him off is TT.

I think I would definitely do this against a more aggressive player who would probably bet the flop & turn with only a single overcard. Bad?

Party Poker 1/2 Hold'em (9 max, 9 handed) converter

Preflop: Hero is BB with 9[img]/images/graemlins/diamond.gif[/img], K[img]/images/graemlins/club.gif[/img].
<font color="#666666">7 folds</font>, <font color="#CC3333">SB raises</font>, Hero calls.

Flop: (4 SB) 9[img]/images/graemlins/club.gif[/img], J[img]/images/graemlins/club.gif[/img], 4[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">SB bets</font>, Hero calls.

Turn: (3 BB) 2[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">SB bets</font>, <font color="#CC3333">Hero raises</font>, SB calls.

River: (7 BB) 2[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
SB checks, Hero checks.

Final Pot: 7 BB