Villain is 20/14 and we've played a lot. He's a losing reg but doesn't seem to do anything spewy or too out of line

After limping preflop how can I play this hand? I think flop is a b/f or c/f because I don't beat anything but a spewy AK

Full Tilt No-Limit Hold'em, $0.50 BB (9 handed) - Full-Tilt Converter Tool from FlopTurnRiver.com

saw flop

Hero (UTG) ($50)
UTG+1 ($14.50)
MP1 ($52.80)
MP2 ($50)
MP3 ($52.30)
CO ($10)
Button ($21.80)
SB ($66.25)
BB ($17.55)

Preflop: Hero is UTG with J, J
Hero calls $0.50, 1 fold, MP1 bets $2.25, 1 fold, MP3 calls $2.25, 1 fold, Button calls $2.25, 2 folds, Hero raises to $12, MP1 calls $9.75, 2 folds

Flop: ($29.25) 10, 6, 3 (2 players)
Hero bets $13, MP1 raises to $40.80 (All-In)