Top pair on draw heavy board vs. Donk and 2+2er

[craigruby]

I think I misplayed this hand on every street and could use some feedback.

I have a fairly tight image and the big stack ($700) at a live $1/2 NYC room. I am in MP with A9o and call a $15 raise (mistake #1) from 2+2er (first pot we've played together). SB calls (he always calls).

Flop is 9 [img]/images/graemlins/diamond.gif[/img]5 [img]/images/graemlins/diamond.gif[/img]6 [img]/images/graemlins/heart.gif[/img]

2+2er bets $30 and I have him on 2 high cards and a continuation bet. Being in position I thought a call would suffice and we'd be HU. I was wrong and the SB called and 2+2er folded I put him on a flush draw since he had been calling bets on draws all night and folding the river when missed.

Turn is an offsuit 8. 2+2er bets $60 and I make it $120.

SB smooth calls and 2+2er folds.

A [img]/images/graemlins/club.gif[/img] is the river

How should I have played the flop?
The turn?
The river?

I know this hand was played pretty horribly.