2014 all_fours anal anal_sex anthro anthro_on_anthro barefoot biped blue_and_white blue_background canine claws clenched_teeth closed_eyes clothed clothing duo from_behind_position fydbac male male_penetrating mammal monochrome mounting neck_grab partially_clothed penetration sex side_view signature simple_background snout teeth textured_background toe_claws toes torn_clothing wolf yaoi