Rule 34 Dev - 1girl bikini blush braid breasts closed_mouth collarbone female_focus grey_eyes grey_hair hair_ornament highres idolmaster idolmaster_cinderella_girls kobayakawa_sae long_hair looking_at_viewer navel pink_bikini side_braid simple_background small_breasts smile solo swimsuit upper_body youhei_(testament)|9232090101