2/4 AKo UTG: Bet this river with 2 pair?

[Beck]

Villain (MP3) is 58/8,86/1,4 so very loose
Hero is UTG with [img]/images/graemlins/club.gif[/img]A [img]/images/graemlins/heart.gif[/img]K

Hero raise, folds to villain who coldcalls, rest folds.
Flop [img]/images/graemlins/spade.gif[/img]J [img]/images/graemlins/spade.gif[/img]K [img]/images/graemlins/diamond.gif[/img]A

Hero bet, villain calls
Turn [img]/images/graemlins/heart.gif[/img]J

hero bet, villain calls
River [img]/images/graemlins/spade.gif[/img]3
Hero bet, villain raise, hero calls

Even though the river completes a flushdraw I still think I need to bet out against this player? And I believe calling his raise is mandatory, but what sort of hands would he raise with, that I beat?