1girl black_hair blue_archive closed_mouth demon_horns demon_tail futanari hair_intakes halo highres horns huge_penis huge_testicles kasumi_(blue_archive) labcoat long_hair looking_at_viewer navel penis pink_background simple_background sirachi sleeves_past_fingers sleeves_past_wrists smile solo standing steaming_body tail testicles veins veiny_penis yellow_eyes