AK full ring 5/10 any way to avoid this ?

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full ring 5/10
Hero is MP with A[img]/images/graemlins/spade.gif[/img]K[img]/images/graemlins/club.gif[/img]

Preflop
3 limpers to hero, who makes it 70, and gets 4 callers (nice)

Flop (280)
A[img]/images/graemlins/diamond.gif[/img]4[img]/images/graemlins/heart.gif[/img]3[img]/images/graemlins/club.gif[/img]
SB leads for 125, folded to hero, who just calls

Turn (550)
K[img]/images/graemlins/spade.gif[/img]
SB leads for 125 again, hero just calls

River (massive)
8[img]/images/graemlins/heart.gif[/img]
SB pushes for 500, hero calls

Anywhere to get off the merry-go-round here ?