The last time you visited the mysterious Gravity Falls was when you were five, and now you're fifteen. Ten years you haven't been to Gravity Falls but you haven't forgotten about it. Your cousin, Wendy, informs you of all that has been happening. Last summer, she told you how two kids, named Dipper and Mabel, saved Gravity Falls from a dream demon. You are curious to know if this dream demon is really dead or alive? You believe your questions will soon be answered when your parents tell you that they are taking a trip back to Gravity Falls. DISCLAIMER: I do not own Gravity Falls!

This is part II because there is a chapter limit! If you are interested in part I, please go to this link: https://www.wattpad.com/story/213954062-thicker-than-water-marauders-era Thanks to all my amazing readers for sticking with this as it continues to get insanely long :P

They say blood is thicker than water. But they don't tell you its the blood of the covenant and the water of the womb. Lavinia Selwyn is everything her parents ever wanted in a daughter. And she's never tried to be anything else. She's a poster-girl pureblood Slytherin who is in all the right crowds and making all the right friends from the moment she sets foot on the train to Hogwarts. She's top in her class and the envy of every girl at Hogwarts. But as pressure from her parents mounts, the disgusted stares of the other houses and the constant insults of the Marauders start to get to Lavinia and her perfect facade begins to crack. Before she knows it, she's struggling to function, practically screaming for help and no one seems to notice. Well. No one who would want to help her anyway. Sirius Black is the last person Lavinia would go to for help.