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I didn't want to scare 1 pair hands on the flop, so I was willing to only call and see what the other players have by their action.

What would you do now?

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Why do you want to keep 1 pair hands in here? You have bottom two and there is a straight draw on the board. By only calling you are allowing other people to draw to their hands for cheap getting good odds. If a 7, 8, T, J, Q, K, or A comes off you now let the straight draw get there or counterfieted your two pair(any card 8 or bigger may give a better two pair). RERAISE this on the flop and get it heads up so you know you're probably only up against somebody with a T or an over pair.

I think you're still in the lead now. SB should have reraised with any of the hands beating you(5T, 9T, 55, 99, TT). But the other raiser could have a set a higher two pair. He could also have QJ and figures his Q or J are outs also and is thinking he can buy a free turn. He might be trying to see if his over pair is good.