2girls, armpits, arms_up, bad_pixiv_id, bare_shoulders, blush, breasts, cleavage, collarbone, folded_ponytail, green_eyes, green_hair, hamedoragon, idolmaster, idolmaster_shiny_colors, large_breasts, medium_breasts, multiple_girls, naked_towel, nanakusa_hazuki, nanakusa_nichika, onsen, partially_submerged, reflection, reflective_water, refraction, siblings, single_sidelock, sisters, smile, towel, water_drop