How should I have played this? Opps only been in for a couple of hands, so I can't really put him on anything. There are too many hands from a loose/passive players range that beat and not enough outs for me to build the pot on the turn, although I possibly would have bet if the K hadn't fallen.

One thing I think I should have done is bet $3.50 on the flop.

Poker Room skin
No Limit Holdem Ring game
Blinds: $0.15/$0.25
9 players
Converter

Pre-flop: (9 players) flyingPenguin is CO with Q Q
UTG calls, UTG+1 calls, MP1 folds, MP2 calls, MP3 calls, flyingPenguin raises to $1.75, 4 folds, UTG+1 calls, 2 folds.

Flop: K A J ($4.65, 2 players)
UTG+1 checks, flyingPenguin bets $2, UTG+1 calls.

Turn: K ($8.65, 2 players)
UTG+1 checks, flyingPenguin checks.

River: 5 ($8.65, 2 players)
UTG+1 checks, flyingPenguin bets $4, UTG+1 folds.
Uncalled bets: $4 returned to flyingPenguin.

Results:
Final pot: $8.65