Stop the attack and be her saviour

As you walk down the stairs, you hear Aunt Petunia screaming. You rush while remaining in control of Dudley. As soon as you reach you relinquish all control of Dudley.

"Aunt Petunia, are you alright? DUDLEY GET AWAY FROM HER THIS INSTANT" You use the stunning spell on him and rush to aid Petunia on her feet.

"Thank you, Harry, but I can believe that Dudley would do such things."

"It's alright, Aunt Petunia. I'll call the cops right away."

"No, Harry. It's alright. He tried to take me on because he was ****."

"But Aunt Petunia, he was the one who murdered Uncle Vernon."

You then explain how Dudley supposedly made the poisoned food and gave it to Vernon. He then explained(lied) on how Dudley knocked him out and locked him in the attic. Petunia's eyes widened and put her head down whispering, "Let me call the policeman. I had enough of this."

"Harry, would you be a dear and get me a glass of milk?" said Petunia with vacant eyes. You know that delaying the situation to dominate her any further will result in nought. As Aunt Petunia, calls the policeman you tie up Dudley and proceed to the kitchen. You start jacking off and shot your sperm on her glass and filled the remaining with milk.

The police come and take away Dudley, and as Petunia drank on she slowly started recovering. But the shock was not fully over yet...