The characters of the Harry Potter universe belong to Ms. Rowlings, and I'm borrowing them for my own imagination.
Gag Gone Wrong
"Fred and James are being way too quiet." Percy muttered to his wife as they were drying the dishes in his mother's kitchen.
"Ginny checked on them and said they were playing nicely with Lucy and Rosie." Audrey reassured him.
"I would have felt better if more kids were here." Percy said.
"They can't help that Roxanne and Albus have the flue."
"That they caught from James and Fred." Percy responded
"At least Angelina and Harry kept them at home to prevent it from spreading any further." Audrey said. "And we knew Bill's family would be in France until tomorrow."
Percy nodded as they finished up and rejoined the rest of the family in the living room.
"We should get going, it is close to Rosie's bed time, and she needs a bath first." Hermione said standing and stretching.
"We should go as well." Percy added. Hermione nodded and went to retrieve the kids.
"I am so delighted that all of you could come today. Tell Harry that we missed him, and Angelina as well." Molly said.
"Sure, Mum." Ginny said as she reclaimed one-year-old Lily.
"We're leaving already?" Fred asked as he, James and Lucy followed Hermione who was carrying Rosie into the living room.
"Yes, we need to get home and check on your mum and sister." George replied.
"Did you have fun?" Percy asked Lucy.
"Uh huh." Lucy said nodding her eyes bright with excitement.
"Good. Now it's time to get home." Audrey said lifting her up and heading for the floo.
When they arrived home, Audrey disappeared into the lavatory with Lucy to start her bath while Percy sat down to sort through some bills.
"Percy!" At Audrey's scream, he jumped up and raced up to the lavatory.
"What?" He asked breathlessly.
"Look at her arm. It won't come off." She said holding up Lucy's left forearm for him to see.
"Take her, I am going to see if I have a potion to remove it." Audrey said.
Percy grabbed a towel and wrapped his daughter in it as he carried her to Audrey's at-home lab.
Percy sat on a chair with Lucy in his lap, turning her so that he could examine her arm better.
"No! If you remove it, they will hate me again." Lucy cried trying to pull her arm out of her father's grasp.
"What? Who did this to you?" Percy asked as Audrey knelt before them with a cotton swab and a potion bottle in her hand.
"It's an initiation. Freddie and Jamie said we could be in their club and they wouldn't prank us anymore if we let them mark us and took a vow to them." Lucy cried struggling to stop her mother from trying to remove it.
"Are we, you and Rosie?" Audrey asked rubbing the potion on with the cotton ball.
"Yes, we don't want to be pranked anymore. We want them to like us." Lucy cried.
"Oh, baby." Percy said as he cuddled his six-year-old daughter close.
"It wasn't a prank. They promised it wasn't!"
"Honey, this is not working, and her arm is turning to red and starting to swell." Audrey said.
"We should floo Ron as well." Percy responded.
"I will go ahead and take her to St. Mungos. You can apparate to Ron's then George's to see if he knows what they did." Audrey said taking a now sobbing Lucy in her arms and headed toward the floo.
He watched them leave then he conjured his patronus. "To George and Ginny. Come to St. Mungos and bring Fred and James with you." He spoke to it then sent the silvery owl on its way before apparating just outside Ron and Hermione's home.
Soon after Percy knocked, Ron opened the door his eyes wide as he held a sobbing Hugo in his arms.
"I was just getting ready to floo Audrey. Something is wrong with Rose. She has a rash on her face and a fever. She is upset and crying and has scared Hugo." Ron said.
"Have you seen her left arm?" Percy asked walking in and following Ron up the stairway to the kids' bedrooms.
"Hermione, look at her left arm!" Ron yelled hurrying to his daughter's room.
"O' sweet Merlin!" Hermione gasped as they entered the room. The area where Rosie has been marked was red and swollen with scratch marks through it.
"We need to take her to St. Mungos. Audrey is already there with Lucy. I sent my patronus to George and Ginny to meet us there so we can find out what their two criminals did to our daughters." Percy said.
"This was a prank?" Ron asked.
"No pank! No more pank! They pomised!" Rosie yelled out as she sobbed. Hermione had the three-year-old cradled in her arms as she headed down the stairs toward their floo.
They reached the hospital and the Welcome witch, having already been briefed by Healer Weasley, directed the small group to the correct ward.
Audrey upon seeing them arrive in the ward rushed up to them and began to examine Rosie's arm while Percy moved to the bed containing his daughter.
"Percy, can you wait for George. We are running tests, but the quicker we have an answer the better. I will put Rosie on fever reducers, but I don't want to treat the infection until I know what is wrong." Audrey said. Percy nodded and kissed his daughter's forehead then hugged his wife tightly.
"You'll figure it out." Percy said.
"Ron, go with him and try to calm Hugo down." Hermione requested. "You should also contact our parents."
"I'll have Dad retrieve yours." Ron kissed his daughter's temple then his wife before following Percy out of the room. Ron headed to floo their parents while Percy conjured his patronus to send to his father-in-law.
"What the bloody hell is going on?" George asked as he entered the waiting room followed by Angelina, Fred Ginny, Harry and James. He didn't see Percy's fist until it hit him squarely in the jaw knocking him flat to the ground.
TBC