Mastering The Transformation Spell!

Accepting an invite into Monster High, Marcus decides that it's best to disguise himself as Ciel Phantomhive - so he can complete a book-finding quest.

Set a few months after 'The Adventurous Surprise of PewDiePie' and inspired by the chapter 'An Adventure in the Monster High World with Shadow Stephanie and Stephano!' from 'Tomodachi Life Stories: Season 4 Sees The Light of Day!' by VictorHyness on WattPad.

Thank you, Victor, as that story helped me a lot - and I did partially reference it.