domoki kenji, kagamine len, kagamine rin, kagamine len no bousou (vocaloid), project diva, project diva (series), vocaloid, 1boy, 1girl, armpits, arms behind head, arms up, bikini, blonde hair, brother and sister, bulge, crossdressing, detached sleeves, green eyes, loli, one-piece swimsuit, polka dot, polka dot bikini, polka dot swimsuit, school swimsuit, short hair, shota, siblings, sleeveless, swimsuit, swimsuit costume, thighhighs, trap, twins