Sticky overpair spot

[Isura]

Preflop is meh, but opener seemed to overplay hands postflop so I took a gamble. But I forgot that BB was 39/7 loose passive, that loves to see flops. Anyways, moving on, I had raised the CO on the flop before with a set and I'm pretty sure his range on the flop is toast against my KK. So I decide to call and encourage him to keep bluffing/overplaying his hand, since I'm not too worried about him having a draw. But wtf does BB's c/r mean? Only other read on BB is that he overcalled (raise, and he was 2nd caller) with AA once. So I though he could be playing QQ/JJ/AT like this, so I call.

On the turn, BB instashoved, and CO thought for a bit before calling. I'm thinking that I'm probably ahead of CO, but worried about BB. I'm getting about 2:1 to call.

Poker Stars - No Limit Hold'em Cash Game - $1/$2 Blinds - 5 Players - (LegoPoker HH Converter)

SB: $200.00
BB: $286.65
UTG: $88.35
CO: $152.75
Hero (BTN): $279.40

Preflop: Hero is dealt K[img]/images/graemlins/club.gif[/img] K[img]/images/graemlins/diamond.gif[/img] (5 Players)
UTG folds, <font color="red">CO raises to $6.00</font>, Hero calls $6.00, SB folds, BB calls $4.00

Flop: ($19) 4[img]/images/graemlins/spade.gif[/img] T[img]/images/graemlins/heart.gif[/img] 8[img]/images/graemlins/spade.gif[/img] (3 Players)
BB checks, <font color="red">CO bets $12.00</font>, Hero calls $12.00, <font color="red">BB raises to $32.00</font>, CO calls $20.00, Hero calls $20.00

Turn: ($115) 3[img]/images/graemlins/club.gif[/img] (3 Players)
<font color="red">BB bets all-in for $248.65</font>, CO calls all-in for $114.75, Hero