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abs angry animal_genitalia animal_penis anthro balls bdsm bondage bound canid canine canine_genitalia canine_penis clenched_teeth collar cord erection fist fox genital_rope genitals knot looking_aside looking_away lying male mammal muscular muscular_anthro muscular_male nude on_back pawpads paws penis red_rope restraints rope rope_bondage saerro simple_background solo spiked_collar spikes spread_eagle spread_legs spreading tail teeth vallhound