Middle pair in a BvB situation

[Sibelius]

Villain is a 33/26/2.7, small sample size

Hero is SB with K [img]/images/graemlins/club.gif[/img]9 [img]/images/graemlins/diamond.gif[/img]
folded to hero, hero raises, BB 3-bets, hero calls

flop: 3 [img]/images/graemlins/heart.gif[/img]K [img]/images/graemlins/heart.gif[/img]A [img]/images/graemlins/diamond.gif[/img] (6 SB)
hero checks, BB bets, hero raises, BB calls

turn: 8 [img]/images/graemlins/spade.gif[/img] (5BB)
hero bets, BB calls

river: 2 [img]/images/graemlins/club.gif[/img] (7BB)
hero checks, BB bets, hero calls

What is the best line on flop? I don't think my c/r-lead was the best. And do you fold the river?