So, I made an aesthetic to introduce Cassidy's twin sister, Colleen.
Maybe these will give an idea of their relationship.

Once Upon a Time, there were two twins born
to a poor couple in a distant land. Both little
girls. One was wrapped in a rose red sweater,
while the other in a heavenly blue scarf. The baby
girl in red was named Cassidy Rose, after the
sweater she had been swaddled in. The other,
Colleen Skye, for the color blue she had been curled
up into.
As the twins grew up, Colleen grew into a beautiful
and mannered maiden while her twin sister was not
as considerate to her surroundings, being just as lovely.
Cassidy was a well known girl to hang around the guys,
where as Colleen was the one all of Cassidy's friends
quickly flocked to.

Where our story begins though, will show just who was the true
beauty of the twins.