Nut flush on double-paired board?

[nietzreznor]

Pokerstars 2/4 (6 handed)

I am UTG with A [img]/images/graemlins/club.gif[/img]K [img]/images/graemlins/club.gif[/img] and $400. I raise to $15, Villain (no reads, also has $400) calls, everyone else folds.

Flop ($35): J [img]/images/graemlins/club.gif[/img] 9 [img]/images/graemlins/diamond.gif[/img] 5 [img]/images/graemlins/club.gif[/img]

I bet $30, villain calls.

Turn ($90): 5 [img]/images/graemlins/diamond.gif[/img]

I bet $50, villain calls.

River ($185): 9 [img]/images/graemlins/club.gif[/img]

I...?


A few questions:

-given my line, what's my play here?
-what line do you guys take on the turn? Sometimes I will c/r all-in here, but I've been finding lately that people at this level (or, rather, esp. at the 1/2) don't lay down very often to that action, so I've been doing big turn c/r with my big hands more and my semi-bluffs yet. any thoughts on different lines here?

thanks