nl200 Overpair vs allin

[martins]

i didnt see villain bluffing river before:

nl200 six handed, hero bets in the CO $9 with A [img]/images/graemlins/club.gif[/img] A [img]/images/graemlins/diamond.gif[/img] and only SB calls his raise.

flop: 4 [img]/images/graemlins/diamond.gif[/img] 6 [img]/images/graemlins/spade.gif[/img] 2 [img]/images/graemlins/club.gif[/img]

SB bets $20, hero calls

turn: T [img]/images/graemlins/diamond.gif[/img]

SB bets $70, hero calls

river: 2 [img]/images/graemlins/spade.gif[/img]

SB goes allin, hero?

full stacks

Should i raised flop?

f calling turn i have to call river too?

ty in advance