1koma, 2girls, animal_ears, closed_eyes, comic, drooling, greyscale, happy, horse_ears, long_hair, lying, mayano_top_gun_(umamusume), monochrome, moriseishiro_(uroshiiserimo), multiple_girls, naked_towel, narita_brian_(umamusume), night, on_back, outdoors, shiny_skin, sky, smile, star_(sky), starry_sky, towel, umamusume