flop 4th nut flush, when do I slow down?

[shuinthehouse]

No reads on BB, but he is 17/4.6/2.1 64 hands, so presumably a decent player, maybe a little tight.

Full Tilt Poker
Limit Holdem Ring game
Limit: $0.50/$1
8 players
Converter

Pre-flop: (8 players) hero is MP1 with 9[img]/images/graemlins/heart.gif[/img] T[img]/images/graemlins/heart.gif[/img]
UTG calls, UTG+1 folds, hero calls, 2 folds, <font color="#cc0000">Button raises</font>, SB folds, BB calls, UTG calls, hero calls.

Limp in MP1 seems appropriate with one limper, T9s is a good hand in a multiway pot but not strong enough to raise here. I think some more aggro types might suggest 3-bet here though? I am 20/11/2.3 over 20k hands .50/1.0.

Flop: 4[img]/images/graemlins/heart.gif[/img] A[img]/images/graemlins/heart.gif[/img] 2[img]/images/graemlins/heart.gif[/img] (8.5SB, 4 players)
BB checks, UTG checks, <font color="#cc0000">hero bets</font>, <font color="#cc0000">Button raises</font>, BB calls, UTG folds, <font color="#cc0000">hero 3-bets</font>, Button calls, <font color="#cc0000">BB caps</font>, hero calls, Button calls.

Check-call-cap line is worrisome, but villain could do this with A2s, A4s, 22, 44, or even slow played AA as well as two trumps, two trumps being the least likely statistically.

Turn: 5[img]/images/graemlins/spade.gif[/img] (10.25BB, 3 players)
<font color="#cc0000">BB bets</font>, <font color="#cc0000">hero raises</font>, Button folds, <font color="#cc0000">BB 3-bets</font>, hero ...

I think the correct play is to call down from here, and further raising is spew, is that too weak? I haven't done anything prior to this to make him think I'm a maniac, so he has to put me on a real hand here.