1girl, arm_up, armpits, blush, breasts, brown_hair, cellphone, cleavage, covering_own_eyes, eyelashes, fingernails, hairband, holding, holding_phone, idolmaster, idolmaster_cinderella_girls, idolmaster_cinderella_girls_starlight_stage, indoors, large_breasts, panties, parted_lips, phone, sakuma_mayu, selfie, shaddoll_fusion, side-tie_panties, sideboob, smile, standing, steam, sweat, taking_picture, underwear, upper_body