I really, really want to fold on the turn

[One Outer]

Canterbury Park 6/12 full game

Villain is actually someone I'm fairly familiar with. He thinks that he is a TAG, but he actually plays too many hands preflop. He's not real excessive. He's probably seeing 4 in 10 flops. He does weird stuff like call 2 cold with T8s on the button with only the raiser in. He is above average postflop and is capable of thinking his way through situations but generally doesn't do it very well. In particular he checks too many river scare cards and misses lots of river bets with top pair type hands. The two middle position players are typical white loose passive guys.

HERO is UTG with A[img]/images/graemlins/spade.gif[/img] K[img]/images/graemlins/spade.gif[/img]

Hero raises, 2 folds, MP calls, HJ calls, 1 fold, Button calls, SB calls, BB calls

Flop (6 handed, 12 SB)

K[img]/images/graemlins/heart.gif[/img] 3[img]/images/graemlins/heart.gif[/img] 8[img]/images/graemlins/club.gif[/img]

SB and BB check, Hero bets, MP and HJ call, Button folds, SB calls, BB folds

Turn (4 handed, 8.5 BB)

6[img]/images/graemlins/spade.gif[/img]

SB checks, Hero bets, MP and HJ call, <font color="red">SB raises </font>, Hero...?

I don't think I can fold here, but I really want to. I do think that the worst thing I can do is call because I want to force the at least one heart draw behind me to call two more. If we're going to continue the hand I feel that raising is the best play. I don't think we're going to see two pair here from villain very often. And the Ah is filthy even if that were the case. Any ideas? Thoughts?