[Closed] NL10 SH, KK vs fish, possible straight on board

Hand converted with online PokerStrategy.com hand converter:

Play hand

$0.05/$0.1 No-Limit Hold'em (5 handed)

Known players:
[tg]BB(Hero)$10.00:///////;MP3$9.97:///////;CO$1.71:///////;BU$12.37:///////;SB$21.00:///////;[/tg]
Stats (VPIP/PFR/AF/Hands)
BU - 91/21/2.9/141

Preflop: Hero is BB with K:d, K:c.
2 folds, BU calls $0.10, SB folds, Hero raises to $0.5, BU calls $0.40.

Flop: ($1.05) 6:s, 4:s, 5:h (2 players)
Hero bets $0.70, BU calls $0.70.

Turn: ($2.45) 9:c (2 players)
Hero bets $1.70, BU raises to $3.4, Hero calls $1.70.

River: ($9.25) 8:d (2 players)
Hero checks, BU bets $4.62, Hero calls $4.62.

Final Pot: $18.49.

Hi,
I'm sure I should bet more on the flop. Should I 3bet all-in on the turn? Straight is possible with 87 or 32, both hands are quite possible for villain (over 90% VPIP and I think he never folded to a raise after limping in)

Thanks!