A/N: I do not own any Sisters Grimm characters or Harry Potter items. This was inspired at a Memorial Day party when I saw my friends father wearing a shirt that said 'I solemnly swear I am up to no good' and I had just finished reading the latest volume of Sisters Grimm and I thought of this story! Well anyway, I hope you like and enjoy!

A paper came inside the news paper and when Granny Relda went down to get it she sensed that it was magical. Taking it upstairs she entered Mirrors' room where the Hall of Wonders resided. Puck, getting up early for no known reason, decided to follow her to see what she was up to, being the Trickster King that he was. Watching her he saw her enter the Hall of Wonders and he went to hide behind a box and wait for her to exit so he could figure out what she was up to.

It took a few moments for her to come back out and when she left the room, Puck went in. Mirror was still in front of the door and when he noticed Puck entering he quickly pulled the key out and put it the keys back on his belt loop. "I'll be taking that now." Puck said and Mirror paled.

"What do you want with it?" Mirror stammered, backing away from the trickster king.

"I want to see what the old lady put in here." Puck answered in all honesty.

Mirror shook his head. "Even we do not know what it is. Just that it has magical properties and could be dangerous." Mirror informed him and Puck shook his head.

"I don't believe it. There is no way that you guys are that blind. You must know something about it." Puck retorted and went to snatch the keys from him.

Mirror dodge but barely escaped the fairies hands. Mirror ran to get into his golf cart, but Puck was able to turn around and rip the key ring off Mirrors belt loop and he started working on figuring out which key went into the key hole. "Stop that! You don't know what's in there." Mirror stuttered as Puck still went about figuring out the correct key.

Mirror was distressed as Puck went through almost the entire keys on the key ring until he found the right one. When the door opened and Puck entered, he nearly had a heart attack. The room was filled with books and other enchanted paper material. "You have got to be kidding me!" Puck cried out in horror as he started feeling tingly.

"I tried to warn you." Mirror stated and recived a glare from the prankster.

"Just tell me where the Old Lady statshed the thing so I can get out of here." Puck ordered and Mirror being enchanted to obey his owners went to do so.

Puck followed, avoiding the books at all cost since he was allergic to both books and hard work. Mirror led Puck to a drawers and reveled the plain piece of paper. Puck picked it up and found tiny writing at the bottom. "I solemnly swear I am up to no good." Puck read aloud and since he was an Everafter it was different than what wizards had to do.

The map showed the blue print of Granny Relda's house and an evil grin spread across Pucks face.

"This is going to be good." Puck stated in a much evil voice.

"Oh dear." Mirror said in response.

A/N: Well it isn't much but if you know Puck you can imagine what kind of horrors and pranks he's going to unleash. I like the ending and it lets your imagination wander. That's all for this so stay tuned for my other stories!