50NL:calling donkbet down w/ TPNK on scary flop?

[kerplunkNL]

Villain is weak-tight: folds to aggression.

Paradise Poker No-Limit Hold'em, $0.25 BB (5 handed) Hand History Converter Tool (http://poker-tools.flopturnriver.com/Hand-Converter.php) from FlopTurnRiver.com (http://www.flopturnriver.com) (Format: 2+2 Forums)

MP ($50.45)
Hero ($77.70)
SB ($54.85)
BB ($18.50)
UTG ($52.30)

Preflop: Hero is Button with K/images/graemlins/club.gif, Q/images/graemlins/club.gif. SB posts a blind of $0.25.
<font color="#666666">2 folds</font>, <font color="#CC3333">Hero raises to $2</font>, SB (poster) calls $1.75, <font color="#666666">1 fold</font>.

Flop: ($4.50) T/images/graemlins/heart.gif, J/images/graemlins/spade.gif, Q/images/graemlins/spade.gif <font color="#0000FF">(2 players)</font>
<font color="#CC3333">SB bets $3</font>, Hero calls $3 ?

Turn: ($10.50) 7/images/graemlins/heart.gif <font color="#0000FF">(2 players)</font>
<font color="#CC3333">SB bets $5</font>, Hero calls $5 ??

[Yaboosh]

There don't seem to be very many hands that you actually beat, especially against a weak-tight guy. Maybe another KQ, but what else does he have here? AK, QJ, JT, TT, JJ, QQ, maybe 99.

If he is really weak tight, bet a river that is a spade or that completes your straight, but otherwise, either fold or call. I just don't know what he could have that you actually beat with your current made hand.

[kerplunkNL]

At the time I thought it was a WA/WB situation. But that's probably not the case here, right?