This is one that's really been bothering me from last night as to whether or not my course of action was correct.

OK, so we're 7 handed sitting in the CO. We are 18/18/0 after 11 hands. We're 1/2 ATS. BB is 36/9/0 over 11 hands, AFq is 75 that's about it. Nothing really of note, after all only 11 hands but he doesn't appear to be a reg and given I've got 50k hands at this level, I would likely have had hands on him or recognized him.

PF I make a pretty standard raise and BB 3bets. At this point, I know I'm likely looking at something in the neighborhood of TT+, AK. So I'm essentially set mining and I would agree that folding to the 3bet would be prudent. Nonetheless, I see the flop and viola! However, villain says that it hit him hard too. I don't think the draws really matter at this point given the range I set for him PF. If you want to include AQs, that would come into play but we're ahead of that at the moment. I would say his range at this point is AA, KK, JJ, AK. I'm not sure QQ would be betting there so I think we can consider taking it out. It's kind of split, I think as to whether we're facing an overpair/tptk or overset. This reeks of rockets to me, but there are a few other hands in his range that make total sense.

I'm lost on how to proceed...

Absolute/UB Cereus No-Limit Hold'em, $0.50 BB (7 handed) - Absolute/UB Cereus Converter Tool from FlopTurnRiver.com

saw flop

Button ($13.30)
SB ($49)
BB ($96)
UTG ($12.80)
MP1 ($97.20)
MP2 ($42.59)
Hero (CO) ($49.25)

Preflop: Hero is CO with 9, 9
3 folds, Hero bets $2, 2 folds, BB raises to $6.25, Hero calls $4.25

Flop: ($12.75) 9, K, J (2 players)
BB bets $12.75