Flop nut flush draw, turn pairs board, Villains get aggressive.

[xenthebrain]

The turn play is fine, the pot is 10BB and you have to pay 2 on a 8 outs draw. That's a call

I would lead the river thou, since they could be afraid of the 4 flush with trips and check it through. When it gets raised I would call whatever comes back.

The pot is just too huge to fold a nutflush on a singlepaired board.
(You must be very sure that you are beaten to fold here, and this cannot ever be the case when you don't know exactly their cards)