Cassandra's Links
Cassandra's afraid of Helena, and desperately is trying to muster the courage to tell Helenus the truth about Helena's personality.
Helena despises Cassandra. She wants to kill her but knows she can't, as doing so could ruin Helenus.
Cassandra worries greatly about Helenus, but knows that her twin depends on her to help keep them out of danger. This has helped Cassandra slowly come out of her shell over the years, and she appreciates it, but damn she wishes Helenus would be more careful. She's working on the courage to tell Helenus the truth about Cassandra.
Helenus trusts Cassandra completely and loves her more than anyone in the world. Nothing can sever their bond. Helenus does their best to cheer Cassandra up whenever they can, and is always their for her.