kugimiya atsuki, agnes tachyon (umamusume), trainer (umamusume), umamusume, absurdres, highres, third-party source, 1boy, :d, ahoge, alternate costume, animal ears, blush, breasts, chair, cleavage, covered navel, crossed legs, detached collar, greyscale, hair between eyes, horse ears, horse girl, horse tail, huge ahoge, lab coat, leotard, monochrome, multiple views, open mouth, pantyhose, shirt, short hair, simple background, sitting, sitting on lap, sitting on person, sleeves past fingers, sleeves past wrists, smile, tail, vest, white background