Tough spot with second boat

[Phoenix1010]

From memory,
1/2 NL 9 max on FTP I think. Villain just sat down recently, I didn't see the hand he gained chips on unfourtunately, so I don't really know anything about him. Effective stacks are around $300.

Hero is CO with AQo.
UTG+1 limps, folds to Hero, Hero raises to $9, UTG+1 calls.
Flop 8 Q Q r.
UTG+1 checks, Hero bets $17, UTG+1 calls.
Turn Kx.
UTG+1 checks, Hero bets $40, UTG+1 calls.
River Kx.
UTG+1 pushes, Hero?