Tricky spot for me

[sean c]

1/2 6 max. SB tag over plenty of hands and BB unknown.

Pre flop: 1 fold, i raise A [img]/images/graemlins/diamond.gif[/img]K [img]/images/graemlins/diamond.gif[/img], 2 folds, sb and bb call.

Flop(3 players 6sb): T [img]/images/graemlins/club.gif[/img]8 [img]/images/graemlins/club.gif[/img]6 [img]/images/graemlins/club.gif[/img]
sb checks, bb checks and i plan on taking one desperation stab at this pot and bet, sb calls and bb folds.

Turn(2 players 4bb): K [img]/images/graemlins/heart.gif[/img]
sb checks, i improve and bet, sb check/raises my butt. What to do?