$10NL. I have about $13
I get AhAd in the sb.
MP+1 makes a 3xbb raise. 2 callers.
I raise it up to 9xbb. 2 callers.
Flop: As 9h 10 h.
Ok, nice...but scary. Pot is about $4-5.
I bet $3.5. 2 callers
Turn: Qd
I throw in the rest. 2 callers!
Is my flop bet two small considering $10 nl is very loose?
Don't I want some dead money in this one, or too risky?
If a heart hits on turn how much do I slow down?

Results:
River: 9 s
aces full I take.

I would probably bet about $4 so just a little more than you did but I think you played it correctly considered the type of player you are normally against at the low of a limit. With a semi-coordinated board, I don't want THAT many callers so I push hard.

What did they have? My guess is QJ and something like Ax.

QJ was one; the other mucked.