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2019 3:4 animal_humanoid aquatic aquatic_humanoid big_breasts big_butt blush bodily_fluids bound breasts butt duo english_text erection eye_patch eyewear faceless_character faceless_male female female_focus fish fish_humanoid frill_(anatomy)genital_fluids genitals glans greyscale hair hands_tied head_crest head_frill hi_res hot_dogging human human_on_humanoid humanoid interspecies jyto long_hair looking_back male male/female mammal monochrome mostly_nude motion_lines non-mammal_breasts penis ponytail precum rear_view sex sharp_teeth sitting sketch smile solo_focus sweat teeth text undertale undertale_(series)undyne vein veiny_penis