You where minding your own business when you found a book at a yard sale. It was strange. It had a red balloon and weird symbol on it on the cover. It was called 'the complete guide to the cult of the balloon' you bought it and took it home
You are now in your living room wondering what you should do with it so you hummer yourself and read the book and find a ritual that will summon a balloon goddess so you do it
Of course after you pop the ritual balloon you appear in Lillian's dimension which is a pitch black void with a solid floor the only light coming from within your body as you feel like a creature is inside of you. You see her Lillian the Eldritch woman about eight foot tall and surprisingly shapely
"Oh a new sacrifice. It's been forever since I've had a balloon to play with" her tentacle hair moved with excitement