Reraise on Turn with small straight in a very big pot?

Hi, I am still beginner on the way to intermediate. PP 2/4 My opponents seem to be good players, maybe slightly loose...
I made my ministraight on turn and want to know, if someone would re-raise with my cards. I thought, that my straight maybe was only second best right there, but on the other hand I can buy a top flush, so it would be kind of "semi-bluff-reraise"!
Opinions?

Party Poker 2/4 Hold'em (10 handed) FTR converter on zerodivide.cx

Preflop: Hero is CO with 2[img]/images/graemlins/diamond.gif[/img], A[img]/images/graemlins/diamond.gif[/img]. UTG posts a blind of $2. MP1 posts a blind of $2.
UTG (poster) checks, <font color="#666666">2 folds</font>, MP1 (poster) checks, <font color="#666666">1 fold</font>, <font color="#CC3333">MP3 raises</font>, Hero calls, Button calls, <font color="#666666">1 fold</font>, BB calls, UTG calls, MP1 calls.

Flop: (12.50 SB) 4[img]/images/graemlins/diamond.gif[/img], 3[img]/images/graemlins/diamond.gif[/img], 9[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(6 players)</font>
<font color="#CC3333">BB bets</font>, UTG calls, MP1 folds, MP3 calls, Hero calls, <font color="#CC3333">Button raises</font>, BB calls, UTG calls, MP3 folds, Hero calls.

Turn: (10.75 BB) 5[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(4 players)</font>
BB checks, UTG checks, <font color="#CC3333">Hero bets</font>, <font color="#CC3333">Button raises</font>, BB calls, UTG calls, Hero calls.

River: (18.75 BB) 7[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(4 players)</font>
BB folds, UTG checks, Hero checks, Button checks.

Final Pot: 18.75 BB