KK hand. 4400 stacks 5-10 6-max..

[Nezzar]

Ok, so ive been at the table for an hour running very well, raising alot preflop and betting and hitting alot of flops.

So now I get KK utg and raise to 40 (standard) and its folded to SB who calls, then BB makes it 140, I call and SB folds. BB has a stack of 6000 and is laggish. He also made a min-raise flopbluff against me in a raised pot a couple of orbits ago and then showed.

Flop(340) 7-8-5r BB bets 350 and I call.

Turn(1040) 5 BB bets 1000, I call.

River(3040) Q BB bets 2000, I call.

What irritates me with this hand is that I just call all the way but at the same time I cant find a good spot for a raise either. Can you?

If you fold the river would your decision change if the river brought a low card?