Middle Set Big Pot

[Justin A]

I've only been in the game a couple orbits, but button is a young guy who's been playing tight, and SB is a tight asian guy.

Horrible player limps, I raise 77, tightish passive guy calls, button 3bets, SB 4bets, limper folds, I call, other guy calls and button calls.

Flop is J75r. SB bets, I call, other guys drops, button raises, SB 3bets, I call, button 4bets, we both call.

Turn is 9 putting up a flush draw. Check, check, button bets, SB calls, I raise, button 3bets, SB folds, what's my play?