You view him as a competitor.. one night it was a party after you all succeeded in creating a strong barrier to protect the country from the monsters outside.You woke up again to find yourself naked with Charles.

“Sob.. Sob.. You stole my first time . You are responsible for this. I can't be a groom for anyone anymore...”

Charles sat with his back to you and continued to sob until his shoulders shook to show you that he was sorry for what had happened and that you were responsible for it.