I am running like shit, everything is going wrong and I am on a big downswing.  I usually dont play this lineup game with a straddle but I decided to play.  I buy in for $700 and lose and now take $1,000 out and run that up to $3,500.  I flopped middle set and dodged everything to win a 3 way pot. 

To this group of players I have a tight image.  Im not a reg in this game at all but people know me as a winning 1/2 or sometimes 2/5 player.  Villian is a reg at the stakes I usually play at but hasnt played in a while.  He is tight but goes nuts w 2 pair type hands on draw heavy boards. 

The hand:

I am in the SB and CO makes it $30.  The button calls and I have Ah6h7s8s and I make it $110.  The BB calls, straddler folds, CO calls.  There is $350 in the pot.   Villian is the BB who has $3,000. 

Flop:

7h9s3h

I lead out for $300.  I lead bc I am the aggressor preflop and this flop creates action and there is no way that I dont have the best hand/draw here.  This is a dream flop....  BB flats and CO flats.  Pot is $1,250.

Turn:

6c

This isnt a great card but its not horrible either.  I thought that when I lead the flop I was vs a K hi flush and a T8 type hand.  I could see the CO having JT8X hand.  This would make sense with his preflop raise and call and call OTF.  I dont think he raises the flop with a FD out there when he has these cards.  Anyways, I check with the intention of calling a bet.  BB pots it for $1,250 and CO folds.  I have about $2,850 behind and the bet of $1,250.  What is our plan here?  The 6 makes T8 but also gives me 2 pair, open ender, nut FD. 

Before we see the river, what are we doing here?