2017 anal anal_penetration anthro anthro_on_anthro anthro_penetrated anthro_penetrating anthro_penetrating_anthro balls bone bone_in_mouth canid dorsal_fin duo elbow_fin english_text erection feet fin fish foot_grab fur gag gagged genitals guide_lines hands_behind_back inner_ear_fluff lying male male/male male_penetrated male_penetrating male_penetrating_male mammal marine on_back onomatopoeia pawpads penetration penile penile_penetration penis sayuncle sex shark signature simple_background sound_effects spots tail tail_fin text tuft white_background