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1:1 2013 abstract_background anthro anthro_on_anthro anus butt canid canine day dragon duo erection eyes_closed female female_penetrated feral flying flying_sex genitals hi_res horn interspecies larger_male male male/female male_penetrating male_penetrating_female mammal membrane_(anatomy)membranous_wings mythological_creature mythological_scalie mythology nateday outside penetration penile penile_penetration penis penis_in_vagina restricted_palette scalie sex size_difference sketch sky smaller_female smaller_penetrated tail vaginal vaginal_penetration wings