Rule 34 Dev - abs age_difference anal anal_penetration anthro anthro_on_anthro anthro_penetrated anthro_penetrating anthro_penetrating_anthro backsack balls bare_back butt duo erection first_person_view fur genitals larger_male looking_at_viewer looking_back male male/male male_penetrated male_penetrating male_penetrating_male male_pov nude older_male penetration penis sex simple_background size_difference smaller_male solo_focus tight_fit vein veiny_penis white_background young young_anthro younger_male younger_penetrated foxserx canid canine mammal black_and_white guide_lines hi_res line_art monochrome|8771425180