2018 all_fours animated anthro anus bed canine digital_media_(artwork) doggystyle duo female female_focus fox from_behind_position human human_on_anthro interspecies larger_male loop male male/female male_penetrating mammal minus8 open_mouth penetration penis pussy pussy_juice sex simple_background size_difference smaller_female solo_focus tail_grab tail_pull vaginal vaginal_penetration