Position play.

Opponent seems fairly loose and aggressive, raising about 1/5 of his hands. I don't know a great deal about how he plays postflop, as I was 8-tabling, but his flop call seems like perhaps a draw, weak king, or high-middle pair below kings. Turn bet good or bad?

PokerStars No-Limit Hold'em, $2 BB (6 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

UTG ($222.80)
MP ($245)
Hero ($200)
Button ($405.80)
SB ($173.40)
BB ($267.70)

Preflop: Hero is CO with A, 9.
UTG raises to $8, 1 fold, Hero raises to $24, 3 folds, UTG calls $16.

Flop: ($51) 3, 2, K (2 players)
UTG checks, Hero bets $30, UTG calls $30.

Turn: ($111) 2 (2 players)
UTG checks, Hero bets $70

I don't like reraising UTG raisers with marginal hands unless they were extremely out of line. His flop call looks something like AK, and I don't think he folds it here. If he has something like a flush draw you probably get him off it with that bet. I'm just not all that fond of this play overall. It also depends on how often you have been reraising preflop.

I don't think they fold this enough to make it worthwhile to fire a 2nd barrel with nothing in this scenario..

i don't think you bet enough on the flop. it looks weak in that it's almost the same size as your PFR. come out like you mean it. at least $40 probably a bit more given your $24 PFR. it usually doesn't add up when your flop bet is the same size as your PF raise.

i like the turn bet size for what you're trying to do, given what you've described as possible holdings. that is adequate. i think it's fairly common for hands like 88-JJ to call your PFRR and then check/call on that flop and see if you quit on the turn. he can't really call the turn when you fire again w/o a draw or K unless you've been out of line on turn bets.

$30 should be sufficient to get him to fold air or a pocket pair below K's. Essentially, any hand he is folding for $40, he is also folding for $30. There's really no need to bet larger. This is exactly how I'd play K-K, anyways.