A dark red color isn't your favorite color, it is Benny's (べに) favorite color. If you know someone named Benny, it will help.
For the secondary reading, think if you see so much 紅 color (like blood, right?) you know that the person is going to die. You know that there is no cure, aka cure ない (くれない). Get it?
What’s the name of the dark red flower?