[schwza]

i would fold. i think the SB has you beat a pretty high %, and if he does, you're drawing very slim. and while BB is probably doing something dumb, he definitely can have a straight / FH / 6x. why would the SB lead out if he didn't have a very strong hand? he knows that the BB is going to call with a wide range.

i really doubt he's going to play a hand like 99 this way as another poster said. first, he's usually going to be 3betting (maybe calling more often to bring the fish in, but still often 3betting), and with this much action i think he's going to just check/fold if hero bets. this is a pretty bad board to double barrel, so i don't see him making this large bet.