[NMcNasty]

I would lean towards calling down. A good aggressive opponent could easily 3 bet K9s-89s preflop (or possibly even the offsuit variations) and checkraise the flop with those hands, not because its the standard play, but because its how good unpredictable players mix it up. Small pairs could also be checkraising since the checkraiser knows he'll get KQ,QT,JT,QJ etc. to fold instantly. Fold before showdown if you see a nine or two more overcards. Raising somewhere along the way will just force you to fold to a 3bet and miss a longshot at your two outs, and raising will never get a better hand to fold.