I don't like the limp up front with KK. I have done it on occassion when I had allowed myself to get somewhat shortstacked and there is not going to be a commitment problem. Especially if I don't get oblidged with a raise behind.
But , you gambled and it paid off, and well. 3 limpers, raise with 3 callers. Once you put your Additional $5 in the pot is over $40. You have to raise more than 18 here. You are offering better than 3-1 preflop and he's a 4-1 dog. That's not terrible mistake. And if someone else calls your raise it's automatic.
When you stick money in the pot have a plan, even limping upfront for a rr. My original plan would have been someone else hopefully riase light, trap him and all the loose callers in the game for extra money. You got the dream result , now pop it HARD. Your plan is not to build a big multiway pot out of position. I would raise minimum 40 here, maybe more with 8 players currently invested in the pot. If heads-up, that 's different, but I still wouldn't raise less than half the pot.
Also, if your loose game is like the ones I am sometimes in, calling huge raises is one of the major weaknesses. And yes, he might have called a 45/50 reraise, but that's fine. You have no decision to make once the flop comes, barring an A maybe. And you must charge this type of player hard for the gazillion times he misses the flop, flops a draw or weak top-pair to make up for this type of result.
You're going to get stacked in a loose game, for sure. The other nite in 1-3 it went limp, limp, lite raiser raises, clueless woman on 3rd buy in(short) and a tought player flat call. Gets to me in BB, I have AJs. Pot is 65 once my 15 goes in. I know lite raiser is out and tough player won't call a huge rr. I make 65 on top. UTG flat calls , leaves himself 140 (calls 1/3 stack) women calls leaving herself 25. All others fold. flop comes Jxx, I shove. Both of them call me. UTG old man had JJ, woman had QQ. I'm third. I mean, I bust out laughing. Not in a mean way, just like oh man, i'm third and i'm putting the money in. And I was not the least upset. I mean, wow. I liked my play and this is a great game. couldn't wait to get to cage to beef my stack back up.
My hand was nowhere as good as yours preflop but point is , in these loose games don't get coy, get that money out there and build big pots. If a king had come instead of a jack I know JJ is folding, QQ i don't know. She was all over the place. But this hand goes down the same if it's TT and AK, except I win.
So pop it hard. Hey , they all fold, you pick up 20+BB uncontested, that's not a terrible result.