I really wanted to fold KK here

Rush poker, no reads. If the limp-reraise had come from UTG, I think I would have folded, but who the hell limps AA at the CO? Given the possibility that the shortstack BB has AA should I discount it entirely from the CO's range and just 5-bet to like $35 or shove to make it look more like AK and get CO to call with JJ/QQ?

Stacks:
UTG ($53.25)
UTG+1 ($45.15)
CO ($91.80)
BTN ($31.55)
Hero (SB) ($88.85)
BB ($20.15)

Pre-Flop: ($0.75, 6 players) Hero is SB
2 folds, CO calls $0.50, 1 fold, Hero raises to $2.50, BB raises to $8, CO raises to $13.50, Hero?

shoving seems ungood with stacks, Id make it just enough to have less than pot on flop the times he calls pre.

ya, am I raising just enough to look retarded strong and leave room to fold, or am I raising so much that I can never fold?

I´m not folding to be sure. And I really wouldn´t worry too much about what I am looking like, the fact that we continue is enough to rep v v strong anyway, no matter what we do. 28/call seems cool.