1boy 1girl armlet armor bad_id bad_pixiv_id bare_shoulders black_shirt blonde_hair blue_eyes blush bracer breasts brother_and_sister castor_(fate) closed_mouth collar diadem fate/grand_order fate_(series) faulds halterneck highres holding_hands ichiko_(fraisecandy_15) looking_at_viewer medium_hair metal_collar open_mouth pauldrons pollux_(fate) robe shirt short_hair shoulder_armor siblings sky small_breasts star_(sky) starry_sky sword twins weapon white_robe