1boy 1girl aku_no_meshitsukai_(vocaloid) aku_no_musume_(vocaloid) allen_avadonia bare_shoulders blonde_hair blue_gemstone bow brooch brother_and_sister choker closed_mouth coat collar collarbone collared_coat collared_jacket dancing detached_collar dress dress_bow dress_flower earrings evillious_nendaiki flower frilled_collar frilled_sleeves frills gem good_twins_day hair_bow hair_ornament hair_ribbon hairclip hand_on_another's_shoulder happy highres holding_hands jacket jewelry kagamine_len kagamine_rin lens_flare light_blush off-shoulder_dress off_shoulder red_gemstone ribbon riliane_lucifen_d'autriche rose sazanami_(ripple1996) short_ponytail siblings smile swept_bangs twins vocaloid waltz_(dance) wide_sleeves window yellow_choker yellow_coat yellow_dress yellow_flower yellow_jacket yellow_nails yellow_rose