1girl a-plug areola_slip blue_archive boots bow box breasts closed_mouth full_body gift gift_box gradient_background green_bow green_ribbon grey_background hair_bobbles hair_ornament highres long_hair looking_at_viewer medium_breasts naked_ribbon navel purple_eyes purple_hair red_footwear red_socks ribbon santa_boots sitting socks solo spread_legs twintails yuuka_(blue_archive)