KQ second pair A high board

Hand converted with online PokerStrategy.com hand converter:

Play hand

$0.25/$0.5 No-Limit Hold'em (6 handed)

Known players:
[tg]BB$59.41:///////;MP2$101.49:///////;MP3$53.57:///////;CO (Hero)$21.74:///////;BU$84.51:///////;SB$50.00:///////;[/tg]

Preflop: Hero is CO with K:s, Q:c.
MP2 folds, MP3 calls $0.50, Hero raises to $2.00, 3 folds, MP3 calls $1.50.

Flop: ($4.75) 9:s, K:d, 6:s (2 players)
MP3 checks, Hero bets $2.50, MP3 calls $2.50.

Turn: ($9.75) A:d (2 players)
MP3 checks, Hero checks.

River: ($9.75) 9:d (2 players)
MP3 bets $9.27, Hero folds, MP3 gets uncalled bet back.

Final Pot: $9.75.

MP3 is 68/29/0,9/45 ; vpip/pfr/af/hands ; fold to cbet 20%(1 out of 5)

cbet probably should be bigger vs this opponent,
but what to do on turn and river?