It's not really a suckout if they have odds, which in this case they do with the low flop bet and a second caller. Bet .4 or .5 when there are two suited or a draw.

OR as Ultimate George showed in a post last week, you can play them slow in hopes to have a huge payday if you know they are on the draw and if you hit your boat. Hitting the boat is a big if, but with two people in a hand and a 30% chance the board pairs by the river, it may be worth it in some cases.