Metalx Stories

This takes place where Cosmo is with sonic and his friends in space. The Metal X (sp?) attacks them saying 'where are they?' and since sonic and his friends dont know what they are talking about they fight them, later on cosmo finds two strange young small girls under the X-Tornado frighten at first she thought they were like her but then they look beyond plant like. She Discovers their name is Midnight Yin and Rose Yang. The Yin-Yang Sisters. Will cosmo tell the others?or Will she keep them as a secret?