A/N: Marlene invites Remus to a party being held by the Ravenclaws. I was going to make Remus go to the party as a werewolf, but I don't think he likes his wolf side enough to make a joke about it, so I went with zombie (scary and ugly).

Disclaimer: I do not own Harry Potter or Mean Girls.

I had already spent a month at Hogwarts, getting to know the Marauders and hanging out with Lily and Severus. The full moon for September came and went, and with a quick excuse of my sick mother (the alibi Professor Dumbledore told me about), the Marauders were none the wiser. I hid out for a week in the Hospital Wing with Mme Pompfrey before rejoining my classes.

With Sirius' blessing, I also tried talking to Marlene more instead of just noticing the way she would scrunch her nose up in thought when she was working on a difficult problem. And things were going pretty good.

There was one day when she asked me for the date.

"What date is today?" she asked, turning her head slightly towards me but her eyes still focused on her parchment.

"October 3," I said, as she gave me a curt nod.

Then one time we spoke about the weather.

"Oh look, it's raining," she remarked while staring out the window near the front of the room.

"Yeah," I said, looking not through the window but admiring the way her hair flowed down her back in soft, black waves that I wanted to run my hands through.

So you could say things were getting pretty serious between us, but I wanted things to move faster.

I took a deep breath and tapped her shoulder. She turned to me with an inquisitive smile. "I'm totally lost with this problem. Can you help me?" I asked, even though I really wasn't. I had already read this topic in our textbook over the summer but she didn't know that.

She took my parchment and started to look at my working. "Oh you need to factoring in the wind direction in your calculations as well," she said.

Wrong. This spell is intangible so wind as nothing to do with this, I thought, but inside I just looked at her and scratched my neck. "I still don't get what you mean."

"Well you see, the spell needs to travel through a medium and interacts with the environment, so you have to use the value of the wind speed they gave us," she said as she traced a finger across my numbers.

Still wrong. The speed is there to throw us off. "Thanks," I said with a smile.

She turned back to her own parchment then tapped in her quill against her mouth, something she did whenever she was going to say something she was unsure of. But I was still surprised when she said, "Me and my friends are holding a costume party for Halloween for the upper years. You should come," she said. "It's an invite just for you, so don't bring a friend or anything."

I blinked once, twice, before giving her an awkward smile and saying, "I'll be there."

So I had to find a costume. From what I read, people normally dressed up as scary things for Halloween. So I went all out to get the perfect, scariest costume I could think of. What I didn't realize was Hogwarts didn't do that.

I had kept my idea a secret the entire time, wanting to surprise everyone, including the Marauders, so I got ready in the bathrooms on the First Floor before heading to the Ravenclaw Common Room.

There were so many students packed in this small room. Some were lounging on the couches, some were standing my the drinks table and some were dancing in an area cleared in the centre. I walked around for a bit before I eventually found Peter and James standing by the fireplace.

"Why are you dressed so scary?" Peter asked, jumping away from me as I came up behind him.

I looked down at my outfit. I had gone for the classic zombie as described in my favourite horror stories. I had tattered one of my old dress robes and coloured my skin grey, with large open wounds and bleeding sores. I had large black circles around my eyes and my hair was matted with fake blood and dirt.

"It's Halloween, isn't it?" I asked.

"Exactly," James said, gesturing at himself, Peter and the people around. I looked about, just noticing that no one else was dressed 'scarily'. The girls were dressed in attractive and alluring versions of animals and most of the guys just wore fancier clothes. James and Peter were both wearing plain black dress robes, though James wore a pair of antlers on his head, while Peter wore a pair of mouse ears.

"Ah, you made it," I heard a girl say from behind me, before I was spun around to face Marlene who jumped back a bit at seeing my face. "And you're a zombie," she added.

I smiled awkwardly and said, "I thought this was a Halloween party." She was wearing what looked like her Ravenclaw Quidditch uniform, though she had altered it a bit to show off her shape.

Marlene smiled and said, "It is, and you'd definitely win an award for best costume if we had one." Then she said to everyone, "I hope you all have a good time. I have to get something to drink."

Sirius was hanging near the drinks table with a few Hufflepuff girls, playfully snapping at the hand of one of them who reached above his head to tug on his black dog ears.

"Didn't anyone tell you you're supposed to wear a costume, not come as yourself," he heard a female voice say from behind him.

Sirius excused himself from the group of Hufflepuffs to turn towards Marlene who was getting herself a butterbeer off the table. He grinned before placing a hand over his heart. "Ouch, that hurts, Marlene," he said, feigning injury.

Marlene rolled her eyes as she uncapped her drink, "You have to have a heart for it to hurt, Sirius."

Sirius scowled down at the girl, before looking away into the crowd. He looked over to where he had left James and Peter, having now seen that someone else had joined his friends. Was that Remus dressed as a zombie? Weird.

He looked back at Marlene to see her looking at Remus as well.

"Oh, you know Remus?" he asked.

Marlene nodded, "Yes, he's cool. I invited him here tonight."

Sirius grinned and said, "Be careful. He really fancies you."

Marlene turned to him in surprise. "Really?" she asked, her face slightly red. "How do you know?"

"He told me," Sirius said. "He's been telling everyone actually, going around school and already telling everyone you're his girlfriend, or as good as. I mean, who could blame him? You're hot."

Marlene had a thoughtful look on her face. She looked over at Remus who gave her a friendly wave. "I don't believe you. Remus is too nice for that."

Sirius shrugged and said, "I'm not saying he's not nice, but he even picked out a promise ring and everything. It's in our dorm right now. He was showing me just last night."

Remus was now doing some awkward imitation of what looked like a hippogriff from this distance, which caused James and Peter to laugh.

Marlene grimaced a bit before looking away from the spectacle and Sirius tried not to smile. Instead, he sighed dramatically and placed a hand on Marlene's shoulder. "I know he's new, but he's my friend. So please, don't think he's weird or anything," he said softly.

Marlene shook her head and said, "Of course I won't. I'll just have to clear up a few things with him."

"That's my girl," Sirius said as he leaned in kissed Marlene, neither of them seeing as Remus left James and Peter and ran out of the common room.

Marlene shoved Sirius off her, putting her hands on his chest and pushing him away. "No, stop. You broke up with me, Sirius, and I heard about you and-"

"Why would I break up with you? You're so hot, Marlene." he said, kissing her again but this time, she didn't push off.

How could Sirius do this? I thought he was my friend. I thought he was going to help me with Marlene but instead, he's snogging her in front of the whole party. I can't believe I trusted him, believed him. I hated him for getting my hopes up, because there's no way a girl like Marlene would ever get with someone like me when there's someone like Sirius around.

I didn't care about the odd looks I got from passing students with my grey and bloody appearance as I made my way through the castle and to the library, knowing I'd find Lily and Severus there.

"...and the dead will rise from their graves, seeking revenge on those who have wronged them," Lily read out in an eerie voice to a bored-looking Severus sitting beside her.

"Come on, Sev. You could at least pretend to be interested," she said in her regular voice when he didn't respond.

Severus was about to say something when I came up behind the pair and placed a cold grey hand on Lily's shoulder.

"Aaaaah!" she screamed, scrambling in her chair closer to Severus' upon seeing my scary costume.

After a stern shush from the librarian and Lily had calmed down, I took a seat across from them and placed my head on my crossed arms on the table. "Sirius and Marlene are together now," I grumbled. I pulled my head up and looked into my friends' faces. "Why would he do this?" I asked,

"That's how Black is. He lies. When we were in First Year, he made everyone think that Lily was," Severus began but was interrupted again by Lily.

"Sev! Never again!" Lily screamed, quieting the boy on her right. "We're not going to let him get away with this," she said to me. "It's time to get revenge on Sirius Black."

I nodded in agreement. I was so ready to let Sirius get everything he deserved.