1girl, animal_ears, arms_up, bad_pixiv_id, bed, black_bra, blush, bra, curren_chan_(umamusume), grey_hair, hair_between_eyes, horse_ears, horse_girl, lying, midriff, navel, on_back, open_mouth, pov, purple_eyes, school_uniform, shirayuki_aiki, solo, tracen_school_uniform, umamusume, underwear, winter_uniform