Thank you for the reviews! here's another long one. I will introduce you to the second pairing of this series: BunnymundxSister!OC
Most of this story will be in Crystal's POV but I'll let you know when it shifts.

I was sweeping the floor but I suddenly jolted and dropped my broom. An icy breeze pounded against my back. I playfully glared back at Jack, who had that silly grin on his face. I shook my head and resumed cleaning. A hole opened up on the floor near me. I stared at it before sighing. "Now how am I suppose to clean this!" Jack walked over and peeked down the hole. "Hey kangaroo! Hopping out or what?" We heard a distinct Australian accent retort back before Bunnymund hopped out with Cerelia and Leo on his back.

"Crystal!" They squealed as they ran over and pulled me into a tight hug. "Hey! How have you been?!" We started engaging in a chatter of squeals and laughter. Leo stuck to clutching my leg but I didn't mind.

At Night

I quietly closed the door to my siblings' room. I almost yelped out in surprise when I came face to face with Bunnymund. I clutched my racing heart as I hissed, "What are you doing?!" He bent down to my height and whispered back, "Sorry. I just wanted to give Cerelia something before she went to bed." He showed me an Easter egg painted with Cerelia's favorite color, pink. "She's already sleeping. I'll give it to her, just wait right here." I snatched the egg as I heard Bunnymund mumbling protests. I inspected the egg before I could touch the door knob. Written hot pink were the words, 'I love you.'

I paused as I slowly turned towards the shameful bunny. I held the egg up and gave him a slight scowl. "What is this?" He slightly flinched at how stern my voice was. Before he could give me an excuse, I rushed towards the dark kitchen and turned the lights on. Bunnymund hopped after me. I leaned on the counter and crossed my arms, waiting. "I've been meaning to tell you. I-I can't help it but I do love her." I checked his expression and it was flooded with desperation and sincerity... With a hint of anxiety. "Bunny, she's 10. Are you serious?" Bunnymund started fidgeting and his ears drooped down. "This is called pedophilia."
"Yeah, but you're with Jack."
"At least I'm old enough to start dating."

We stared at each other before I sighed and closed my eyes, thinking. I reopened them and shifted in place. "Okay, this is what I think should happen." Bunnymund nodded. "Wait until she's 16 or older. Then, you can date her. So can you at least wait for 6 years for her?" Bunnymund thought for a moment and looked me dead in the eye. "Just for her." He answered firmly. I smiled at how lucky my sister is. Most boys couldn't wait for a girl so they just forget about them and go get another. "I admit, you're perfect for her. You have my trust. If you are able to wait for her." Bunnymund smirked, determined. "Just watch." He stated, making me smirk back.

Next Morning

I pulled Bunnymund back before he could reach the dining room. "Hey Bunny, a little reminder." Bunnymund looked at me patiently. I leaned towards his face with my scary face I used on people when they bother me. "Make a move on her and I'll snap those furry little ears of your's, got it?" He gulped and agreed and rushed to the dining room. I entered after him, smiling contently as if nothing happened.

3rd POV

Bunnymund offered some cake to Cerelia, which she happily accepted. Everyone except for Leo and Cerelia could feel Crystal's threatening aura rising. When Bunnymund turned to look at her, Crystal gave a crazed smile and waved to him. Bunnymund quickly waved back, trying to act tough, but inside he was cowering with his tail dangling between his legs if it were longer.

The whole day went with Crystal watching Bunnymund's every move with her insane aura that Bunnymund had to excuse himself to go to the bathroom just to let out his fear alone. Jack entered the bathroom, knowing full well what Bunnymund was actually doing. "Hanging in there, buddy?" Jack leaned on the wall as Bunnymund tried to pull himself together. He couldn't act weak in front of Jack. "What do you care?" Bunnymund replied. Silence overtook them for awhile. "Oh who am I fooling?! Your sheila's freaky! I can feel her tiny little hands pulling off my ears menacingly already!" Jack chuckled and gave Bunnymund some words of encouragement.

After that whole day of visiting, Bunnymund took the siblings back to the Warren. But not before Crystal could threat- I mean, remind him once more. Jack sat on Crystal's bed as she climbed onto it. "Weren't you a little, oh I don't know, harsh on Bunny?" Crystal thought for a moment and shrugged. "No not really." Jack stared at Crystal, disbelieving that the timid girl could be so tough. "Besides, it's called pedophilia. He's way older." Jack clutched his heart. "Aw, I'm hurt." He joked. Crystal couldn't help but chuckle. "Come here." She beckoned with her arms outstretched. Jack crawled towards her and they embraced each other. Crystal got a bit used to Jack's coldness that it became warm to her now.

Warren

The children were sleeping peacefully in their own rooms. Bunnymund snuck into Cerelia's room to check up on her. She rested peacefully on the hay with a warm, wool blanket. Her chest bobbed up and down in a relaxing beat. Bunnymund caressed her cheek lightly and smiled faintly. But it was a sad kind of smile. Too bad he couldn't hold her as he liked but he was determind to wait for her if it was the last thing he would do.

"My lovely, little sheila..." He whispered. He looked through a window near by and saw that the moon lit brightly in the dark sky. Bunnymund gazed at the moon somewhat desprately as if to say, 'Please hurry up and make her older.' But of course, everyone must shift on their own accord so he nor the man in the moon could really help it.