2girls, asakura_toru, bare_shoulders, bath, bathing, bathtub, black_hair, closed_eyes, collarbone, fangs, fukumaru_koito, hair_bun, idolmaster, idolmaster_shiny_colors, light_bulb, multiple_girls, naked_towel, onsen, open_mouth, plant, single_hair_bun, skin_fangs, sunlight, towel, towel_on_head, water, wet