1girl, d, =_=, animal_ears, big_belly, big_hair, blush, breasts, drill_hair, fang, horse_ears, horse_girl, huge_breasts, isemagu, jacket, kneeling, long_hair, marvelous_sunday_(umamusume), midriff, navel, on_bed, open_clothes, open_jacket, open_mouth, partially_unzipped, shortstack, sleeves_past_wrists, smile, solo, sweatdrop, tracen_training_uniform, track_suit, twin_drills, twintails, umamusume