This is one I wrote a while ago as an omake for Coeur Al'Aran's 'White Sheep' fic. Only found it while I was looking for something else, so here you go.

I forgot what the prompt was, but it involved Summer Rose's ghost.

"Madam Salem?" Dr Watts saw his boss with saggy eyes and a slouched posture. "Is something wrong?"

"Yes Dr Watts, we have a problem," Salem simply said in an annoyed expression.

"What is it that I can help you with," he asked.

"Booooooo~" A white transparent being said as she floated past them.

"That accursed silver eyed warrior we killed recently has started haunting my palace like an annoying ghost."

"Boooooo~ WooooOOOooooh~" she floated by again, wiggling her fingers.

Salem's eye twitched as she lashed out at her with her tentacles but the phased right through her. Summer smiled and flew through the floor.

"And as you can see, she has become something of a constant pest."

Summer reappeared by a window. A Beowulf walking down the hall took notice. Summer stuck her tongue out and the Grimm lept forward to kill her. Instead, he went right through her and crashed through the window, howling as he fell down to its doom.

"I'll… I'll see what I can do about this," Watts said as he scratched his head.

"Thank you," Salem rubbed her eyes and yawned. "She has been making it difficult to sleep, keeping me up and influencing my dreams with unpleasant thoughts."

(flashback)

The ghostly Summer creeped up to a sleeping Salem.

"Jaune is sterile and won't give you grandbabies," she whispered into her ear.

(present)

"Salem I was wondering i- is that a ghost?!" Cinder walked up and then jumped at seeing Summer.

"Yes, that is the silver eyed warrior we recently slain," Watts explained. "She decided to be childish and try to haunt us."

"Hey," Summer cupped her chin, "if you're suppose to be watching Jaune, and you're here and he's not with you." She grinned and sunk into the floor. "Let the hunt for my feast begin!" She bellowed just before she was gone.

Salem's eyes widened with panic. She didn't know if ghosts could actually eat children, but she wasn't in the mood to find out! Especially with her precious young ones!

"Move! Alert the others! Get the kids!" She shouted. As they all sprang into action to save Salem's children from the kid eating ghost.

Several moments later, after the hallway as cleared, Summer rose back up from the floor, laughing while she did. She couldn't actually eat people, but they didn't need to know that.

Was it it mean? Yes. But they killed her and she was sort of trapped here, so she has a right to torment them.

She chuckled and rubbed her hands together as she sunk back into the floor. She was gonna have fun tormenting them.