40 minutes into a MTT on bodog with 20/40 blinds.

UTG limps
Button limps
I am SB with A3soooted (diamonds) and call
BB checks


Flop K33 with 2 hearts... Pot is 160

I have bet into almost every flop i have seen then if called have bet the turn too. So I think they expect me to bet...

Do you make a probe bet of 100
Check hoping someone will bet and you can reraise
If you check and they check around then another heart puts a flush out there.
If you check they may be suspect you checked
If you bet you may take down a small pot
Or if you bet and someone has a K or heart draw you may get paid off..

What do you do?