25NL - KQs in midposition is re-raised preflop, faces flop bet

[bober2]

How should this be bet?

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

Button ($25.35)
SB ($24.15)
BB ($19.50)
UTG ($24.65)
Hero ($40.30)
CO ($41.40)

Preflop: Hero is MP with Q[img]/images/graemlins/diamond.gif[/img], K[img]/images/graemlins/diamond.gif[/img].
UTG calls $0.25, <font color="#CC3333">Hero raises to $1.25</font>, <font color="#666666">1 fold</font>, <font color="#CC3333">Button raises to $4</font>, <font color="#666666">2 folds</font>, UTG folds, Hero calls $2.75.

Flop: ($8.60) 3[img]/images/graemlins/diamond.gif[/img], 5[img]/images/graemlins/diamond.gif[/img], 6[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">Button bets $5.75</font>, Hero calls $5.75.

Turn: ($20.10) 8[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, Button checks.

River: ($20.10) 7[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, Button checks.

Final Pot: $20.10