Rivered flush in huge pot bet or CR

[ISF]

Villan had been playing pretty aggressively try to cr the field, or just bet out? As I had backdoored the flush I didnt think it would be that scary.
Party Poker 10/20 Hold'em (6 max, 6 handed) converter (http://www.selachian.com/tools/bisonconverter/hhconverter.cgi)

Preflop: Hero is MP with K/images/graemlins/diamond.gif, Q/images/graemlins/diamond.gif.
UTG calls, <font color="#CC3333">Hero raises</font>, <font color="#666666">1 fold</font>, <font color="#CC3333">Button 3-bets</font>, SB calls, <font color="#666666">1 fold</font>, UTG calls, Hero calls.

Flop: (13 SB) 3/images/graemlins/diamond.gif, 9/images/graemlins/club.gif, 5/images/graemlins/heart.gif <font color="#0000FF">(4 players)</font>
SB checks, <font color="#CC3333">UTG bets</font>, Hero calls, <font color="#CC3333">Button raises</font>, SB calls, UTG calls, Hero calls.

Turn: (10.50 BB) 9/images/graemlins/diamond.gif <font color="#0000FF">(4 players)</font>
SB checks, UTG checks, Hero checks, <font color="#CC3333">Button bets</font>, SB calls, UTG calls, Hero calls.

River: (14.50 BB) 2/images/graemlins/diamond.gif <font color="#0000FF">(4 players)</font>
SB checks, UTG checks, Hero checks, Button checks.

Final Pot: 14.50 BB

[marand]

I think a check/raise on the river is fine here. But I would have folded on the flop.
There is a very high risk that the flop will get raised behind you and you probably don't have more than 3-4 outs here.

[Haupt_234]

I don't like your flop call at all. I fold in this spot, especially with the button behind you who 3bet preflop. With just an overcard draw with outs that have a good chance of being dubious and a backdoor flush draw, calling the flop here is spewing.

Given your play, I would bet out on the river. Even though the button is aggressive, I think you can get atleast 1-2 calls by just betting out here since there are so many players left at the river.

Haupt_234