This is a great time to check and take a free card. Being HU with the aggressive initiative, youll be betting strong draws like flush draws most of the time on the turn, this hand is an exception to the rule. The BB calling on this flop shows a lot of strength, I would almost certainly put him on a hand that isnt folding at any stage of this hand, so becuz I dont think the villain will fold to a turn bet, semibluffing with your strong draw loses its utility.