alpha_(yukai_na_nakamatachi) babydoll bangs bare_shoulders black_hair blue_eyes blush breasts collarbone commentary_request covered_navel eyebrows_visible_through_hair hair_between_eyes hairband hips idolmaster idolmaster_cinderella_girls large_breasts long_hair looking_at_viewer lying on_side panties parted_lips sagisawa_fumika simple_background solo strap_slip thighs twitter_username underwear white_background white_panties