[alekhine8]

I think a flop raise is in order for three reasons.

First - you are probably ahead at this point. Putting money in the pot when you are ahead is a good thing.

Second, SB could be betting just about anything in this spot - any pair, any paint that hit or missed, or complete cheese. Raising the villian on the flop will give you a little more information on his hand. He could still 3-bet you with a lower pocket pair (or worse) or wait until the turn to check/raise you with AA/AK/KK/44/22/clubs, but it helps.

Third, it can potentially get you to showdown for likely 2BB assuming you check behind on the turn and call a river bet.