flopped medium flush, what now?

[tehDiceman]

fairly new villian, hadnt seen him do anything out of the ordinary. no real reads though.

didnt think i would get any action on that flop but i did. i knew i wasnt slowing down on this hand unless a fourth spade dropped. then villian check/called the turn like he did the flop. it smelled of single spade or something big. the river paired the board and villain snap pushes like it was his job. i got that really crappy feeling and took a few minutes. he could be doing this with pocket 7's, pocket 10's, pocket 4's, 8x, any two spades, as well as possibly a donked spade draw. he could be doing it with a straight like J9 or the like also.

what do you guys think?

PokerStars No-Limit Hold'em, $0.02 BB (6 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

saw flop|<font color="#C00000">saw showdown</font>

SB ($4.15)
<font color="#C00000">BB ($2.77)</font>
UTG ($3.24)
MP ($5.17)
CO ($0.96)
<font color="#C00000">Hero ($5.05)</font>

Preflop: Hero is Button with 9[img]/images/graemlins/spade.gif[/img], 8[img]/images/graemlins/spade.gif[/img].
UTG calls $0.02, <font color="#666666">2 folds</font>, <font color="#CC3333">Hero raises to $0.1</font>, SB calls $0.09, BB calls $0.08, UTG folds.

Flop: ($0.32) 4[img]/images/graemlins/spade.gif[/img], 7[img]/images/graemlins/spade.gif[/img], T[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(3 players)</font>
SB checks, BB checks, <font color="#CC3333">Hero bets $0.26</font>, SB folds, BB calls $0.26.

Turn: ($0.84) 8[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
BB checks, <font color="#CC3333">Hero bets $0.78</font>, BB calls $0.78.

River: ($2.40) 8[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">BB bets $1.63 (All-In)</font>, Hero ?????