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anal anal_penetration anthro anthro_penetrated basitin bdsm biped blindfold bondage bottomwear bound clothing digitigrade dominant dominant_human dominant_male duo from_behind_position hi_res human human_on_anthro human_penetrating human_penetrating_anthro interspecies keith_keiser kokoro-tokoro loincloth lying male male/male male_penetrated male_penetrating male_penetrating_male mammal monochrome mostly_nude nude on_side pawpads penetration sex simple_background spoon_position submissive submissive_anthro submissive_male trace_legacy twokinds white_background