1girl black_footwear black_socks black_wings blue_skirt breasts demon_girl demon_horns demon_tail demon_wings dress_shirt full_body game_cg hand_on_hip highres horns huge_breasts kneehighs loafers long_hair low_wings manabe_riri marshmallow_imouto_succubus mole mole_under_eye monster_girl official_art open_mouth pleated_skirt shirt shoes short_sleeves skirt socks solo standing sumeragi_kohaku tail transparent_background white_shirt wings