50/100 Deep Stack Weird River

[theBruiser500]

5 handed, hand vs. icebreaker again we have something like 18k a piece. he limps, i raise pot to 450 with KK, will do this often he calls. flop is

kc jc 7h, he check calls my pot bet. turn is 4, he check/calls pot bet

river is 9s, he checks. pot is 5k or 5.5k something like that we have 15 or 16k left beind. i have a hard time putting him on a hand that will call a decent sized value bet, and if he c/r me all in on this huge pot i will [censored] my pants. thoughts on river?