50NL,KK facing flop raise and turn bet

[pokerfan]

villian is your standard TAG reg running 14/11/3.3 with 3 bet 3% from MP. He only reps 3 sets on the flop vs hero's strong ISO fish range. Plan is CRAI or c/f. c/c, c/c is probably not optimal in these FR games vs normal regs.He might pick up some drawing hands and go for semi-bluffing.
No-Limit Hold'em, $0.50 BB (8 handed) - Hold'em Manager Converter Tool from FlopTurnRiver.com

CO ($128.85)
Button ($55.25)
SB ($89.60)
BB ($38)
UTG ($13.80)
UTG+1 ($37.80)
MP1 ($54.25)
Hero (MP2) ($53.60)

Preflop: Hero is MP2 with K, K
UTG calls $0.50, 2 folds, Hero bets $2.50, CO calls $2.50, 4 folds

Flop: ($6.25) 9, 5, 3 (2 players)
Hero bets $4, CO raises $10, Hero calls $6

Turn: ($26.25) J (2 players)
Hero checks, CO bets $15, Hero ?