PREFLOP: I would fold, I know your in the SB so you have a little discount but 99 does not play well OOP against the usual range of an UTG raiser. Another factor that should make you lean towards a fold is that you also have no information on your opponents, which increases the probability that you will make mistakes postflop. If there were 3 people committed to the pot outside the blinds, I would call here since Im getting the odds to flop a set, with just 2 people committed I would fold.

FLOP: Given your relative position to the raiser, checking and going for a checkraise or betting out are both fine plays IMO. Once you checked and the BB bets and everyone else calls, calling now looks right. Checkraising in this spot and building the pot would not be sound poker IMO since the equity of your holding is going to change dramatically with the turn card.

TURN: This is a bad card for obvious reasons. I would check and see what happens. If the BB bets, and everyone folds, I would call down since there is still a great chance you have the BB beat. If the BB bets and both other players call, its time to leave and fold the turn. IF the BB bets and UTG folds, and UTG+1 calls, this is a much tougher spot since you would assume the UTG+1 would raise if he hit the king, and the BB's hand is most likely tied to the flop, but folding still wouldnt be a bad play here, since you are probably in a way behind/barely ahead situation, meaning the times youre ahead you will still get rivered quite often and the times you are behind you are drawing to 2 outs.

This best advice I can give you on the turn is to check it, and see what develops and use your judgement to decide if you should continue in the hand.