I would raise KJs here but not K9s. As far as a c/r...

1 we want to protect our hand- if we c/r a 9 high flop w/ TP and can fold out 2 players or something.

2 we are right before a pfr and want to get value- let him bet, everyone else call and we can c/r for value.

3. when we improve our hand and were not the aggressor on a previous street.

Im sure there are more examples but those are just a few. None of them apply here. Had you not raised PF you could try and c/r for value or for protection, however our hand is pretty safe w/ 1 overcard possible and no draws. Usually I'd just bet this out. Reads are also important since we need someone to bet- nothing worse than giving free cards when we are ahead and they would have called our bet.