What would you do? #167 - Pwning myself?

I think I botched this hand terribly, but because he is such a passive player, I'm able to not hurt myself too bad.

Full Tilt Poker $0.25/$0.50 No Limit Hold'em - 7 players
The Official DeucesCracked.com Hand History Converter

BB: $78.55
UTG: $65.35 - 50/20 / 100% steal / no other meaningful stats @ 10 hands
UTG+1: $53.45
MP: $24.75
CO: $63.15
Hero (BTN): $50.00
SB: $52.00

Pre Flop: ($0.75) Hero is BTN with Ac As
UTG calls $0.50, 3 folds, Hero raises to $2.50, 2 folds, UTG calls $2

Flop: ($5.75) Qc Ks Js (2 players)
UTG checks, Hero bets $3.50, UTG calls $3.50
Anyone betting this flop?  I think this is definitely a bet / fold situation, but he calls behind.

Turn: ($12.75) 6d (2 players)
UTG checks, Hero checks
Definitely wanting to pot control here.

River: ($12.75) 7s (2 players)
UTG checks, Hero bets $7, UTG calls $7
He's been so passive that he can easily have a Kx, Qx type hand looking to get to showdown.  I think I fold if he raises.  Is this a leak as well?  Should I be betting the river here?

Final Pot: $26.75
UTG shows Ad Td (a straight, Ace high)
Hero shows Ac As (a pair of Aces)
UTG wins $25.45
(Rake: $1.30)