Marshall Lee Fanfiction

In this story; You, Stargazer Marionette, are a vampire and a life-long friend to Fiona and Cake. Your sister Marceline, decides it's good for you to meet a fellow vampire royalty member. Your cousin, Marshall Lee the Vampire King, is who'll you'll be living with while Marceline is away, forever with her betrothed. How will your life with him role? READER-CHAN!!! I actually don't know I'm just making it up as i go