HJ is running at about 15/11, is raising pretty light from position, standard taggy type. I 3bet him the previous hand, and he folded pf. seems like the perfect spot for another 3bet. Have no idea about the SB caller, but I assume bad. I flat called pf to allow him to come along, and because I will have less than pot behind on the flop.

What do we do when checked to on the flop???

PokerStars No-Limit Hold'em, $2 BB (9 handed) Poker-Stars Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

SB ($223)
BB ($200)
UTG ($201.85)
UTG+1 ($234.10)
MP1 ($81.10)
MP2 ($197)
MP3 ($302.60)
Hero ($209)
Button ($204.75)

Preflop: Hero is CO with A, A.
4 folds, MP3 raises to $6, Hero raises to $18, 1 fold, SB calls $17, 1 fold, MP3 raises to $66, Hero calls $48, SB calls $48.

Flop: ($200) J, 3, 7 (3 players)
SB checks, MP3 checks, Hero......