Big pot, enemy flush,Kings up on 5th...

[nef]

$0.50 ante, $1 bring-in, $3/$6 stud

I am dealt (Kc6h)Kh. 4h brings it in, 7c calls, 9d calls, I complete, Ad cold-calls, 8h folds, 9h cold calls, 9s cold calls, 4h,7c,9d call the raise.

On 4th it looks like:
P1 XX 7c 8c
P2 XX 9d Tc
ME Kc6h Kh 6c
P3 XX Ad Qd
P4 XX 9h 8s
P5 XX 9s 2s
P6 XX 4h 5d

P3 bets, P4 calls, P5 folds, P6 calls, P1 raises, P2 folds, I call (comments? - I considered all 3 actions), P3 reraises, P4, P6, P1 and I call.

5th Street looks like:

P1 XX 7c 8c Ts
ME Kc6h Kh 6c Qc
P3 XX Ad Qd 8d
P4 XX 9h 8s 9c
P6 XX 4h 5d 5c

The open nines (P4) bet with only 1.5 big bets left in his stack. I have to admit I lost it a little here. I was planning on calling one bet to close the action when everyone checked to the probable flush. Now this guy bets his horrible dead hand. UGH! P6 and P1 call to me and I am facing an almost certain raise behind me. I figure this hand is basically between me and the flush, and if I make a full house its not likely I'll lose to the other hands. What would you do?