Hand converted with online PokerStrategy.com hand converter:
$0.1/$0.2 Fixed-Limit Hold'em (7 handed)
Preflop: Hero is MP3 with A:c, A:d.
2 folds, Hero raises, CO folds, BU 3-Bets, SB caps, BB folds, Hero calls, BU calls.
Flop: (13 SB) Q:h, 6:h, J:d (3 players)
SB bets, Hero calls, BU raises, SB 3-Bets, Hero caps, BU calls, SB calls.
Turn: (12.5 BB) T:h (3 players)
SB bets, Hero folds, BU raises, SB calls.
River: (16.5 BB) 6:s (2 players)
SB bets, BU raises, SB calls.
Final Pot: 20.5 BB.
I would probably raise flop to protect and fold Turn once flop has been capped.
On the flop I would expect you to be against KK, flushdraws, AK-gutshots and trips. Once the turn card completes the flush draw and the straight draw the last thing you want to do is to engage in a raising war with just the rockets. KK is the only hand you beat really.
Let's see what the judges say.
Imho, good laydown, I know it was hard. Just keep telling yourself about winning by folding 
you have to raise the flop immidiately. you have an overpair but your one pair hand is quite vulnerable and the pot has become so big at the point that you don't even wanna give a cheap shot to any backdoor flushdraw. so raise the flop and if SB 3bets then just call down since you could be far behind against QQ and JJ (6combos) and you are just still ahead against KK (6combos). on the turn you have to call and if BU raises you have to call again if somebody has just AQ KK or QJ. you have some outs to bust a 2pair (with the 6 for example) and you can make your set and a straight against a set and who knows how reasonable bu plays. calldown from the turn on and if you think BU is reasonable you can fold the river if sb donks and BU raises again.
