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4_toes anthro arms_tied barefoot bdsm blush bondage bound countershade_feet countershading feet foot_fetish foot_focus front_view fully_bound green_pawpads hands_behind_back hi_res legs_tied legs_up lock machine male mammal mrvalentim nude pawpads plantigrade protogen restraints rope sitting soles solo stocks submissive submissive_male tickle_torture tickling toe_restraints toes toes_tied zenith_(zentheprotogen)