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2015 7_tails absurd_res angry anthro balls bdsm bondage bound canid canine dogfu erection fox genital_rope genitals glowing hi_res humanoid_genitalia humanoid_penis male mammal multi_tail muscular muscular_anthro muscular_male navel nipples penis penis_rope restraints rope rope_bondage simple_background solo submissive submissive_male tail vein veiny_penis