[andyfox]

First hand I fold. Mr. Aggressive is going to make it too expensive to draw to my draws.

Second hand I call preflop knowing passive button must have a bigger pocket pair. If I flop a set I could win a ton of chips. Tough spot on the flop. All three options have drawbacks. With a less preflop/passive button, I'd check-raise because he could have unimproved high cards; here it's more likely I'm going to get 3-bet. So I think I'd opt for check-calling and hoping, since I have a backdoor straight draw. Yes, the 9s are vulnerable to a turn overcard, but we're likely beat by a bigger pocket pair already.