NL10: KK hand, flush card on river

[ElectricWaffles]

Here's a hand I played not long ago. Any thoughts are welcome

Party Poker - No Limit Hold'em Cash Game - $0.05/$0.10 Blinds - 9 Players - (LegoPoker Hand History Converter)

SB: $2.05
BB: $7.67
UTG: $2.14
UTG+1: $9.41
MP1: $1.70
MP2: $2.04
MP3: $9.69
CO: $1.90
Waffles (BTN): $9.98

Preflop: Waffles is dealt K[img]/images/graemlins/spade.gif[/img] K[img]/images/graemlins/heart.gif[/img] (9 Players)
6 folds, <font color="red">Waffles raises to $0.30</font>, SB folds, <font color="red">BB raises to $0.80</font>, Waffles calls $0.50
Uncalled bet of $0.00 returned to Waffles

Flop: ($1.65) Q[img]/images/graemlins/diamond.gif[/img] 3[img]/images/graemlins/diamond.gif[/img] T[img]/images/graemlins/club.gif[/img] (2 Players)
BB checks, <font color="red">Waffles bets $1.20</font>, BB calls $1.20

Turn: ($4.05) Q[img]/images/graemlins/spade.gif[/img] (2 Players)
BB checks, Waffles checks

River: ($4.05) 7[img]/images/graemlins/diamond.gif[/img] (2 Players)
<font color="red">BB bets $2.50</font>, Waffles folds
Uncalled bet of $2.50 returned to BB

Pot Size: $4.05

My main read was that this guy is very passive post flop but liked to raise a fair bit pre-flop.

The check on the turn was lame, I know. What about the river though? Good fold?

Results in white below:-

<font color="white"> I timed out thinking about it and he was kind enough to show TT for a full house </font>