She takes off her clothes and her entire lower body is just alien tentacles coming out of the bottom of her shoulders. When wearing clothes, she just wraps them all up into the shape of a human so that she can look normal in them. Her "assets" are just the excess tentacles lengths that, if used for the rest of her "body," would have made her way too tall to fit in her uniform. She noticed "hm, human females sometimes have tumorous growths protruding from their bosoms" and decided that therefore putting her tentacles there would be 100% inconspicuous and totally natural.