I have nut straight on turn. 3 flush cards showing, do I raise?

[spydog]

MP2 here is loose passive (42/0)
UTG is laggy (42/12)

Flop: Call or fold this? Anyone raise this?

Turn: Is this a clear raise on the turn? I can't see MP2 betting a flush draw on the flop, so I'm probably best. Plus, I need to push out UTG if he has a lone club. Plus, it's easy to fold to a 3-bet, no?

Party Poker 3/6 Hold'em (8 handed)

Preflop: Hero is Button with K[img]/images/graemlins/spade.gif[/img], A[img]/images/graemlins/diamond.gif[/img].
UTG calls, <font color="666666">2 folds</font>, MP2 calls, <font color="666666">1 fold</font>, <font color="CC3333">Hero raises</font>, <font color="666666">2 folds</font>, UTG calls, MP2 calls.

Flop: (7.33 SB) T[img]/images/graemlins/club.gif[/img], Q[img]/images/graemlins/diamond.gif[/img], 7[img]/images/graemlins/club.gif[/img] <font color="blue">(3 players)</font>
UTG checks, <font color="CC3333">MP2 bets</font>, Hero calls, UTG calls.

Turn: (5.16 BB) J[img]/images/graemlins/club.gif[/img] <font color="blue">(3 players)</font>
UTG checks, <font color="CC3333">MP2 bets</font>, Hero .....

[Fat Nicky]

Flop on call is fine although you might want to raise to knock out UTG and possibly get a free river card.

Raise the turn, MP2 could have anything here.

[beginner]

Raise flop. Try to get UTG to fold and MP2 to slow down. This would also make your turn decision easier.

Being that you didn't raise the flop, I'd raise the turn. 3-bet will usually mean a flush.