Flopping two pair out of the blinds; facing TAG c/r

[Mike MacIntosh]

UTG is a donk, SB is a TAG, and I am running TAG. I was really confused in this spot. 3bombing with the intention of getting it in does not seem all that good against a TAG here because we are either flipping or WB. Thoughts?

Poker Stars, $1/$2 NL Hold'em Cash Game, 6 Players
LeggoPoker.com - Hand History Converter

BTN: $630.70
SB: $242.85
Hero (BB): $413.35
UTG: $120
MP: $197
CO: $220

Pre-Flop: 2[img]/images/graemlins/club.gif[/img] 5[img]/images/graemlins/club.gif[/img] dealt to Hero (BB)
UTG calls $2, 3 folds, SB calls $1, Hero checks

Flop: ($6) 5[img]/images/graemlins/diamond.gif[/img] 3[img]/images/graemlins/club.gif[/img] 2[img]/images/graemlins/diamond.gif[/img] (3 Players)
SB checks, <font color="red">Hero bets $6</font>, UTG calls $6, <font color="red">SB raises to $18</font>, Hero ???