Rule 34 Dev - 10s 2girls absurdres black_hair brown_eyes brown_hair hibike!_euphonium highres kousaka_reina long_hair lying midriff midriff_peek multiple_girls navel neckerchief nyantype official_art on_floor open_mouth oumae_kumiko pink_neckerchief pinky_swear purple_eyes rotational_symmetry school_uniform serafuku short_sleeves|7682261184