Nut Flush Draw - too aggressive?

[tree_stump]

This is a pretty unremarkable hand, but the villain is a 2+2er, and I'm wondering if he saw something in my play to help his call here - I'm not going to identify him, but leave that up to him.

UB (1/2 Kill)
I'm the button, villain is SB.
Folds to LP (button - 1), who calls. I call (with K [img]/images/graemlins/club.gif[/img] 9 [img]/images/graemlins/diamond.gif[/img]), SB completes, and BB checks.

Flop is A [img]/images/graemlins/club.gif[/img] 7 [img]/images/graemlins/club.gif[/img] 2 [img]/images/graemlins/club.gif[/img]
Checks to me, and I bet. All but SB fold.

Turn is 3 [img]/images/graemlins/heart.gif[/img]
SB checks, I bet, SB calls.

River is 8 [img]/images/graemlins/diamond.gif[/img]
SB checks, I bet, SB calls.

Results in white below:
<font color="white">
Hero shows 9d Kc.
Hero has 9d Kc 7c Ac 8d: ace high.
SB shows 8c 2h.
SB has 8c 2h 2c Ac 8d: two pair, eights and deuces.</font>

So, I have two questions... Given the board, do you think it was unrealistic to try to semi-bluff at this hand (my thinking is that the SB either has one low club or a low pair, or maybe both)?

And secondly... if you remember this hand, was there something in my play that suggested that I was bluffing, or were you simply calling on the strength of your pair and low flush draw?

-stumpy