Vulnerable top pair.

[mongidig]

30-60 live 9 handed. I know this may seem basic but I am just doing a check-up.

HJ limps(He is tight preflop, very aggressive post flop. I have seen him make it three bets out of position with just overcards heads up. He bets his draws and pairs very strongly.)

Button calls(Tight, seems good)

SB calls(very aggressive both preflop and postflop. Has no ability to get away from a hand no matter how scary the board is. He will call raises and bets pretty lightly preflop and on the flop.)

I check in BB with Ad9d.

The flop: 9c7s4s.

I bet, HJ raises, SB calls, I reraise, both call.

The turn: 9c7s4s4c

SB bets. What is my play? The SB by the way is loose enough to have a 4. I have made a couple free showdown raises against him up to this point.

Was my flop three bet correct? Or would you call and wait to see what comes on the turn?