Is my flush good enough?

[Stealthy]

MP1 here is 73/4/0.5 so your basic loose calling type player.

Party Poker 1/2 Hold'em (10 handed) FTR converter on zerodivide.cx

Preflop: Hero is BB with 7[img]/images/graemlins/heart.gif[/img], T[img]/images/graemlins/heart.gif[/img].
<font color="#666666">3 folds</font>, MP1 calls, <font color="#666666">1 fold</font>, <font color="#CC3333">MP3 raises</font>, CO calls, <font color="#666666">2 folds</font>, Hero calls, MP1 calls.

Flop: (8.50 SB) T[img]/images/graemlins/spade.gif[/img], 2[img]/images/graemlins/heart.gif[/img], 5[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(4 players)</font>
Hero checks, MP1 checks, <font color="#CC3333">MP3 bets</font>, CO calls, <font color="#CC3333">Hero raises</font>, MP1 calls, <font color="#CC3333">MP3 3-bets</font>, CO calls, <font color="#CC3333">Hero caps</font>, MP1 calls, MP3 calls, CO calls.

Turn: (12.25 BB) K[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(4 players)</font>
<font color="#CC3333">Hero bets</font>, <font color="#CC3333">MP1 raises</font>, MP3 folds, CO calls, Hero?

I pumped the pot with my pair and flush draw and makd my flush on the turn. But what do I do in this spot when a passive wakes up? I am going to showdown but for how much?