Question about flopped bottom set on 3 flush/straight board.

[kipin]

Party Poker No-Limit Hold'em, $ BB (6 max, 5 handed) pokerhand.org hand converter

SB ($245.05)
BB ($519.14)
UTG ($169.1)
Hero ($200)
Button ($398.19)

Preflop: Hero is MP with 8[img]/images/graemlins/club.gif[/img], 8[img]/images/graemlins/diamond.gif[/img]. SB posts a blind of $1.
<font color="#666666">1 fold</font>, <font color="#CC3333">Hero raises to $7</font>, Button calls $7, <font color="#666666">1 fold</font>, BB calls $5.

Flop: ($22) 9[img]/images/graemlins/spade.gif[/img], 8[img]/images/graemlins/spade.gif[/img], K[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(3 players)</font>
BB checks, <font color="#CC3333">Hero bets $20</font>, Button calls $20, BB folds.

Turn: ($62) J[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, Button checks.

River: ($62) 2[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets $50</font>, <font color="#CC3333">Button raises to $100</font>, Hero calls $50.

Final Pot: $262

Button is a bit retarded and is pretty aggressive. Basically my question is, how do you play the turn and river? Flop and preflop seem pretty standard to me.