PS $100+R KK vs Donkey

[Ogre]

I have been playing with the villian for the whole first hour. He busted many times and rebought. He was very loose passive. Limped in and called alot of pf raises called bets post flop. He doubled me up with 97 on a AK9 board. Since then he has became a pretty big stack.

Seat 1: Donkey (17010 in chips)
Seat 7: OGRE (10065 in chips)
OGRE: posts big blind 150
*** HOLE CARDS ***
Dealt to OGRE [Kc Kh]
supernova9: folds
epokerman: folds
Donkey: calls 150
stefanos23: folds
Eninga: calls 150
SheFaLLs: folds
ActionJeff: folds
Gurre: folds
OGRE: raises 600 to 750
Donkey: calls 600
Eninga: calls 600
*** FLOP *** [Qh 4d 2h]
OGRE: bets 1050
Donkey: calls 1050
Eninga: folds
*** TURN *** [Qh 4d 2h] [Qd]
OGRE: bets 1050
Donkey: calls 1050
*** RIVER *** [Qh 4d 2h Qd] [6c]
OGRE: bets 1200
Donkey: raises 12960 to 14160 and is all-in
OGRE...? 6k behind me with the average around 8k

I decided to continue bet pretty small because he had been folding to bigger bets in past hands. With this line I would also lose the least when he had me beat.