Rule 34 Dev - 10s 2girls alternate_costume artist_request black_hair blue_eyes blush book breasts brown_eyes brown_hair chalkboard collar eyebrows height_difference houshou_(kancolle) huge_breasts kantai_collection long_hair long_sleeves multiple_girls necktie open_book open_mouth ponytail udon-udon yamato_(kancolle) yuri|7189748865