kagamine len, kagamine rin, vocaloid, 1girl, 2boys, age difference, androgynous, bisexual male, blonde hair, blush, bow, breasts, brother and sister, censored, cooperative fellatio, crossdressing, cum, dark-skinned male, dark penis, dark skin, fellatio, green eyes, hair bow, hair ornament, hair tie, hairclip, headset, incest, interracial, loli, multiple boys, necktie, open mouth, oral, penis, pointless censoring, ponytail, short hair, shota, siblings, small breasts, teamwork (sexual), tongue, twincest, twins