Disclaimer: I do not own Sailor Moon or Harry Potter. I only own the plot line for this story.

Timeline: It starts at my own version of the battle at the Department of Mysteries. It is many years after Serena turns into Cosmos.

Summary: AU During the fight at the Department of Mysteries the Order and the Trio meet Luna's Guardian Angel. She disappears soon after bringing up a lot of questions for the next year along with two new teachers.

Lady of the Stars

Chapter 4:

Sirius was just about to ask another question when he was interrupted by another Order member who came to speak to Dumbledore. "Sir, we have secured all the Death Eaters but one. They seemed to be trapped to the wall by a glowing chain and none of our spells are able to release him we can't even get close to him without been blown away."

Dumbledore looked confused as did others as they walked over to see a short man chained to the wall of the room. Luna gasped and then looked to Sere realising that she had put him there. Serenity walked forward toward the man stopping only a little way away. "I put him there as I needed to decide how to punish him." She spoke calmly to Dumbledore.

"What did this one do to you, miss? If I may so inquire." Dumbledore questioned charmingly.

"He tried to kill my charge and therefore must suffer the consequences." Sere walked up to the Death Eater who seemed to be shaking at every step she took, 'If he could speak he would probably be whimpering now,' she thought. "I want to see who it is who thought they could harm Luna without repercussions." She pulled off his mask showing the face of a small and chubby man who had strong resemblance to a rat.

People gasped at the sight of the Death Eater as Serenity stepped away, it was Peter Pettigrew! Others who were not so sure about Sirius innocence believed he was now. Sirius would have pounded Peter there and then if he could but he was being restrained. 'That bastard! Wait til I get my hands on him.'

After hearing the gasp she turned around and looked at the expressions of recognition from the crowd. She turned curiously to Dumbledore as he seemed to be the leader and also the strongest. She was surprised at feeling such a powerful aura coming from such an old man, but when she heard his name she remembered he was the one to defeat an evil wizard a few decades ago. She remembered reading that in one of the history books on this dimension, it was a very helpful book as it kept updating itself as things happen, though she hadn't read it for a few years. "Do you know this man? Who is he?" she asked in a demanding tone.

"That man is Peter Pettigrew. He was the one that betrayed the Potters to Voldemort (people shivered) and framed Sirius for the crime as well as faking his own death." Dumbledore then remembered that if he didn't persuade Serenity to let them deal with Pettigrew they would not be able to prove Sirius innocent. "My dear, would you mind letting us deal with Peter? With him we would be able to prove Sirius innocent and get information from him that could be vital to us."

Serenity looked at him a little longer before turning her gaze to Luna. She decided to let Luna choose. As she knew the situation better and Sere didn't know enough at the moment to make the best decision. Understanding the silent question Luna nodded her head letting Serenity know that she thought that she should hand Peter over. Sere nodded back and turned towards the Death Eater. She recalled the chain, but not before sending a power shock making Peter slump to the floor. Where Dumbledore 'stupified' and bound him to prevent him from getting away.

Footsteps were heard coming, the order and the children knew that they had to get out of there; however the anti-apparation wards had gone back up. As everyone tried to figure out a plan to explain why Sirius Black was there along with some school children, Serenity turned towards Luna hoping she would explain the crisis.

Luna walked up to her protector as Sere asked her a question. "What is the matter?"

"The ministry officials are coming down and if they see some of the people here they will arrest them. The ministry aren't really on our side at the moment. So now everyone is trying to figure a way out but the wards are up so no one can apparate out and there is only one door."

"Where do you want to go?" She enquired casually.

"Well… I suppose the best place to go would be Hogwarts. You know my school." Sere smiled remembering the few times she visited Luna in Hogwarts. She enjoyed all the magic going around the castle, it gave off the same pleasant warmth it did when it was young. "Alright, I will get us there." Before Luna could reply Serenity muttered a few words and the needed disappeared in a trail of silver sparkles. The ministry officials entered the wreckage and started their investigation of the events that had transpired. Never knowing that they had just missed some very interesting characters.

Reappearing in the empty great hall everyone fell to the ground with surprised shouts. Confusion was all around as to how they got there when they heard Luna comment towards her friend. "How are you able to do that? No one has been able to apparate into Hogwarts." They all turned to look at the woman who didn't notice their attention.

"I didn't exactly apparate here dear Luna." She replied with a full blown smirk on her face. 'It's not like I am unwelcome,' she thought as she felt the familiar greeting from the castle. 'It's nice to see you too old friend.' She replied to the sentient castle.

"Oh yeah! So how long are you gonna stay?" Luna said remembering who it was she was talking to. Bursting with excitement that she might have the chance to listen to more of Sere's adventures.

A sad expression came over Sere's face, knowing that she would upset Luna. "I'm sorry Luna but I can't stay. I have some business to attend to," at Luna's crestfallen expression she tried to cheer her up, "don't worry, I will be seeing you sooner than you think!" Luna hugged Serenity goodbye glad to know she won't be gone long. As she let go she watched Sere disappear in a flurry of silver stars, she turning towards the rest knowing she would be in for a lot of questioning but also knowing that she won't be able to give much.