A Twist Of Two Fates

Rin Kagamine was a almost normal teen. Until one day her fate was twisted all up by a mysterious Vocaloid named Len from her parents project 'Vocaloid 2.0'. Len was created in Rin's mirror image. So they look alot alike. But are anything but alike. NOT INCEST. THEY ARE NOT RELATED. EVEN THOUGH I HAVE NOTHING AGAINST I...