FURVERT!

anthro anus ass_up backsack balls bdsm blue_eyes bondage bound butt canid canine cave chain collar digitigrade fur fur_markings gag genitals glistening glistening_butt glistening_pawpads hi_res howlart looking_at_viewer looking_back male mammal markings muzzle_(object)muzzled nude pawpads penis presenting presenting_hindquarters raised_tail scared slave solo tail tail_anus tail_tied tape tape_gag wrists_to_ankles