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anal anal_penetration base_two_layout basic_sequence dragon duo erection female flaccid four_frame_image four_frame_sequence gender_transformation genitals grid_layout hi_res human human_to_anthro humanoid_genitalia humanoid_penis injection male male/female male/male male_penetrated male_penetrating male_penetrating_male mammal motion_path mtf_transformation mythological_creature mythological_scalie mythology nipples object_motion_path penetration penis scalie sequence sex species_transformation tail transformation transformation_by_substance transformation_mechanism transformation_sequence transformation_through_injection two_row_layout vaginal vaginal_penetration xander_the_blue_(artist)