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2018 anthro anthro_penetrated anus bioluminescence biped blue_vulva butt close-up dragon duo erection female female_on_human female_penetrated genital_focus genitals glowing human human_on_anthro human_penetrating human_penetrating_anthro humanoid_genitalia humanoid_penis interspecies male male/female male_on_anthro male_penetrating male_penetrating_female mammal mythological_creature mythological_scalie mythology penetration penile penile_penetration penis penis_in_vagina scales scalie sex signature somewhatsketchy tail tan_body tan_scales vaginal vaginal_penetration vein veiny_penis vulva