What's the Play?

[TexasJ]

20 buy in cash game no limit holdem with the boys. I have about $50, doing well. Not too much bluffing. I get KK in last position before the button. I raise 2 which is the normal raise. button folds sb raises 2. BB folds, mp calls, fold, I raise 2. SB and MP both call. Flop J 10 2 rainbow. SB goes all-in and he has the MP and myself covered. The MP calls and then I call figuring this. I knew one of them must have had AJ or KJ. The SB will sometimes buy the pot. I figured maybe SB had pocket 10's and was trying to push hard if neither of us had nuts. Anyway you tell me what you think I should have done and then I'll tell you what happened.
J