NL100 Zoom KJs

After 124 hands CO plays 15/13 with 36% CO UO PFR. He basically plays nitty EP+MP and loose in CO+BU. He cbets 100% so far, AFq= 70/50/0. WTSD 50%, W$SD 20%. What should our sizing be on the river and should we fold if he bets? Would you bluff anything in your range here or value bet a hand like AQ and why?

Poker Stars, $0.50/$1 No Limit Hold'em Cash, 6 Players
Poker Tools Powered By Holdem Manager - The Ultimate Poker Software Suite.

Hero (BTN): $100 (100 bb)
SB: $100 (100 bb)
BB: $211.60 (211.6 bb)
UTG: $242.25 (242.3 bb)
MP: $162.69 (162.7 bb)
CO: $100 (100 bb)

Preflop: Hero is BTN with K J
2 folds, CO raises to $2.50, Hero calls $2.50, 2 folds

Flop: ($6.50) Q 4 K (2 players)
CO bets $4, Hero calls $4

Turn: ($14.50) 8 (2 players)
CO bets $9, Hero calls $9

River: ($32.50) K (2 players)
CO checks, Hero bets ??