Nut flush on turn when you think full house made? Why Raise?

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I'm not sure here. I think people would say I should raise here on turn so I can find out where I am. If he 3 bets me I could be in trouble, but since he capped flop, I think he has 2 pair or set. If he 3 bets me on turn, would I consider folding either there or to a bet on river? I doubt he will just call if he just has 2 pair so what am I gaining here? Or did I play this right [img]/images/graemlins/smile.gif[/img]

Party Poker 0.50/1 Hold'em (9 handed)

Preflop: Hero is Button with A[img]/images/graemlins/club.gif[/img], 4[img]/images/graemlins/club.gif[/img].
UTG calls, UTG+1 folds, MP1 calls, MP2 folds, MP3 folds, CO folds, Hero calls, SB completes, BB checks.

Flop: (5 SB) J[img]/images/graemlins/club.gif[/img], 5[img]/images/graemlins/club.gif[/img], 8[img]/images/graemlins/heart.gif[/img] <font color="blue">(5 players) </font>
SB checks, BB checks, UTG checks, MP1 checks, <font color="CC3333">Hero bets</font>, SB calls, BB folds, <font color="CC3333">UTG raises</font>, MP1 folds, <font color="CC3333">Hero 3-bets</font>, SB calls, <font color="CC3333">UTG caps</font>, Hero calls, SB calls.

Turn: (8.50 BB) 8[img]/images/graemlins/club.gif[/img] <font color="blue">(3 players) </font>
SB checks, <font color="CC3333">UTG bets</font>, Hero calls, SB calls.

River: (11.50 BB) T[img]/images/graemlins/spade.gif[/img] <font color="blue">(3 players) </font>
SB checks, <font color="CC3333">UTG bets</font>, Hero calls, SB calls.

Final Pot: 14.50 BB
<font color="#990066">Main Pot: 14.50 BB, between UTG, Hero and SB.</font> &gt; <font color="white">Pot won by Hero (14.50 BB).</font>

Results in white below: <font color="white">
SB shows Kc 9c (flush, king high).
UTG shows Jh 5s (two pair, jacks and eights).
Hero shows Ac 4c (flush, ace high).
Outcome: Hero wins 14.50 BB. </font>