Her Diary!

You see her diary jutting out of the bag, along with whips, strapons and cuffs and also, a flask filled with white liquid. You open her diary as you read,

.... my fat brother, passed away. I know I am supposed to be sad, but finally, I am able to get his house as well as his money. Oh, he was a whimpering fool until that Petunia came into his life. She brought in everything that is weird to us, including that abnormal nephew of hers. Oh, the days when Vernon was my bitch and I even used him as my first toy. Those were the days. Anyways thank the gods that their son is also an equal idiot, it will be quite easy if I give him food as bait. I could make him obese as he was before or I could make him ravish Petunia thus I can prove that they murdered Vernon. Oh well, at least it will be enough to convince the jury. The only thing that remains is that Potter boy. No matter. He will never get the benefits of the will. I'm sure Vernon will choose me over him...

You now remember every instant of your childhood where you witnessed her getting close with Vernon. You also remember Vernon cowering under the table as he dropped his fork often and Marge would be flustered as if she's drunk. You even saw those cuffs and whips before but you had thought that it was for you for your misdeeds around the house. You shudder at every thought realising the trauma that she caused everyone around her. She is the Umbridge of Muggles. Anyway, you continue flicking through her pages to know her intentions.

...oh my god. I can't believe that Dudley killed his own father and attempted to dominate Petunia. Foolish boy, he should have come to me for help and I would have helped him in becoming a master as well. But that is alright with me. One step closer to Vernon's money and only Petunia stands in my way. I have bought this potion online that makes me sexually active whenever needed. These past few days I had no ways of letting my self loose. I even thought of doing with my dogs. Gosh that made me wet just by thinking of it but I can't anymore. It is turning dry each time and now I have one vial left. I can use that over Petunia over the days and little for me once I get Petunia in my firm hands. I may even get that Potter boy as my new fucktoy instead of those friends of Dudley who came across me the other day. It didn't satisfy me because their meat was so tiny. I remember that Mutt, having a larger tool than the others. Well I should be visiting Petunia soon now...

You then barfed outside the window. Ugh. Aunt Marge after you... you seriously gave way for Marge to butt in. You have no means to eliminate her away from Petunia. Dudley is gone now hence a wasted opportunity. But there is a way, it seems Aunt Marge takes a bit from the flask almost every night. All you have to do is find a way to distract her...