1girl, animal_ears, antlers, arknights, artist_name, ass, bad_pixiv_id, bare_arms, bare_shoulders, black_leotard, blue_eyes, blush, breasts, brown_pantyhose, deer_antlers, deer_ears, deer_girl, envelope, fake_tail, from_behind, hair_between_eyes, holding, holding_envelope, large_breasts, leotard, looking_at_viewer, looking_back, pantyhose, parted_lips, pixiv_id, rabbit_tail, rifu_(643763873), sideboob, smile, solo, strapless, strapless_leotard, tail, viviana_(arknights), web_address