You and Morro were best friends, you became friends with him because you accidentally summoned him instead of lady spades. Neither you nor him knew who to remove his spiritual bond to you, so you two became friends to make it easy on both of you instead of hating one another.

Morro convinced you to watch a series of movies with him in return he'd watch a series of movies with you of your choice, little did you know that it was a horror series. Morro loves horror movies especially ones with unique killing ways, so he put on 'scream' the original.