Rule 34 Dev - 1girl aketa_chika armpits arms_up black_bra blush bra brown_hair collarbone gradient_background highres idolmaster idolmaster_cinderella_girls looking_at_viewer mouth_hold navel panties pants panty_peek pantyslip ponytail profile rubber_band simple_background solo sports_bra sweatdrop track_pants tying_hair underwear yuuki_haru|17606211129