50NL BB special under fire

[2outs]

Reads: Villain is 26/11/2.9

Flopped bottom two here but villain seems to like his hand as well. How to proceed?

PokerStars No-Limit Hold'em, $0.50 BB (9 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

CO ($16.15)
Button ($12.80)
SB ($42.80)
Hero ($52.30)
UTG ($81.80)
UTG+1 ($20.05)
MP1 ($37.85)
MP2 ($66.75)
MP3 ($42.55)

Preflop: Hero is BB with 5[img]/images/graemlins/heart.gif[/img], 2[img]/images/graemlins/heart.gif[/img].
UTG calls $0.50, <font color="#666666">1 fold</font>, MP1 calls $0.50, MP2 calls $0.50, <font color="#666666">1 fold</font>, CO calls $0.50, <font color="#666666">1 fold</font>, SB completes, Hero checks.

Flop: ($3) 5[img]/images/graemlins/diamond.gif[/img], 2[img]/images/graemlins/club.gif[/img], 8[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(6 players)</font>
<font color="#CC3333">SB bets $2.5</font>, <font color="#CC3333">Hero raises to $8</font>, UTG folds, MP1 folds, MP2 folds, CO folds, <font color="#CC3333">SB raises to $20</font>, <font color="#CC3333">Hero is confused</font>