NL50 SH TPTK in 3bet pot river question

[castor11]

$0.25/$0.50 No Limit Holdem
5 Players
Hand Conversion Powered by weaktight.com (http://weaktight.com/)

Stacks:
UTG ($42)
CO ($75.34)
hero (BTN) ($51.19)
SB ($36.10)
BB ($83.08)

Pre-Flop: ($0.75, 5 players) hero is BTN :ad: :kc:
1 fold, CO raises to $1.25, hero raises to $4.50, 2 folds, CO calls $3.25

Flop: :ks: :7h: :5h: ($9.75, 2 players)
CO checks, hero bets $7, CO calls $7

Turn: :2h: ($23.75, 2 players)
CO checks, hero checks

River: :9c: ($23.75, 2 players)
CO bets $12, $12 to hero ($39.69)?

Call or fold? turn?

[babyonboard]

too good odds to fold and his rvr agg is inf so i would call. [12 to 36-->u have 2 b good once in 4 2 b even.]

[The teoszan]

I would call this OTR,but on the turn I would bet to protect my hand probably would check behind otr if he would check.

[castor11]

I call. He had flush.