1boy, 1girl, ?, alternate_costume, animal_ears, bed, blush, breasts, casual, clothed_female_nude_male, from_behind, heartbeat, heavy_breathing, hokko_tarumae_(umamusume), horse_ears, horse_girl, horse_tail, huge_breasts, legs_together, long_braid, looking_at_viewer, nude, purple_eyes, ribbon, sagging_breasts, simple_background, sitting, smile, solo_focus, tail, tomato_rice, umamusume