Weird line with a made flush vs a loose/passive

[Wolfram]

Villain is 46.5/7/1.7 after 50 hands. I've been pretty laggy.

He instacalled the flop bet fwiw. Anybody like this line?

Poker Stars - No Limit Hold'em Cash Game - $0.50/$1 Blinds - 6 Players - (LegoPoker Hand History Converter)

Hero (SB): $114.70
BB: $104.45
UTG: $158.05
MP: $58.35
CO: $95.90
BTN: $62.70

Preflop: Hero is dealt 7[img]/images/graemlins/diamond.gif[/img] J[img]/images/graemlins/diamond.gif[/img] (6 Players)
3 folds, BTN calls $1.00, Hero calls $0.50, BB checks

Flop: ($3) 3[img]/images/graemlins/diamond.gif[/img] K[img]/images/graemlins/heart.gif[/img] 4[img]/images/graemlins/diamond.gif[/img] (3 Players)
<font color="red">Hero bets $3.00</font>, BB folds, BTN calls $3.00

Turn: ($9) A[img]/images/graemlins/diamond.gif[/img] (2 Players)
<font color="red">Hero bets $6.00</font>, BTN calls $6.00

River: ($21) K[img]/images/graemlins/spade.gif[/img] (2 Players)
Hero checks, <font color="red">BTN bets $10.00</font>, <font color="red">Hero raises all-in to $104.70</font>