NL200: KQ makes top 2pair

[Jeans]

Poker Room skin
No Limit Holdem Ring game
Blinds: $1/$2
5 players
Converter

Stack sizes:
Hero: $337.50
CO: $331.90
Button: $63.95
SB: $279.40
BB: $316.10

Pre-flop: (5 players) Hero is UTG with K[img]/images/graemlins/spade.gif[/img] Q[img]/images/graemlins/spade.gif[/img]
<font color="#cc0000">Hero raises to $7</font>, 3 folds, BB calls.

Flop: Q[img]/images/graemlins/club.gif[/img] K[img]/images/graemlins/club.gif[/img] 6[img]/images/graemlins/club.gif[/img] ($15, 2 players)
BB checks, <font color="#cc0000">Hero bets $10</font>, <font color="#cc0000">BB raises to $20</font>, Hero calls.

Turn: 8[img]/images/graemlins/diamond.gif[/img] ($55, 2 players)
<font color="#cc0000">BB bets $40</font>, Hero calls.

River: 5[img]/images/graemlins/heart.gif[/img] ($135, 2 players)
<font color="#cc0000">BB bets $150</font>, Hero ?

Villain is 25/12/1.5 but a sick calling station, calls with middle pair like 3 streets of value, but I don't know what to do when a calling station turns maniac, does he always have the flush here? Also he once bluff raised the flop with air