A collar

“Isn't that too much?” Asked Ginny with concern, when Luna told her about Hermione's next naked adventure.
“No.” Luna answered simply.
“And you are sure it will work?” Continued Ginny with questions.
As she looked at black collar with a small silver buckle.
Luna just nodded.
“So if Hermione put this on..” Started Ginny another question.
“When, not if.” Luna corrected her with a surprisingly confident tone.
Ginny rolled her eyes.
“When Hermione put this on. It will cast the illusion of clothes. So everyone who will see her will think she is wearing her uniform but in reality she will be naked?”
“Exactly.” Confirmed Luna.
Ginny suspiciously turned the collar in her hands.
Growing up with Fred and Gorge and her experience with Tom Riddle diary made her cautious about things like this.
“What if someone touches her? Will they feel the fabric or her skin?”
Instead of answering, Luna reaches out, grabs Ginny's hand and puts it on her shoulder.
“What do you feel?” She asked with a mischievous smirk.
It took Ginny a couple of seconds to understand.
Her eyes opened wide in surprise.
“No way!”
Ginny gasped and squeezed Luna's shoulder.
She could feel the fabric of Hogwarts uniform.
Lunna just watched her friend as she moved her hand from her shoulder to her chest.
Before Ginny realized what she was doing. Luna tapped with her wand on the back of her neck.
And with that her clothes disappeared.
Ginny gasped again and looked at her hand.
Which was now on Luna's naked breast.
“Sorry”
Ginny says and quickly takes her hand from Luna's boob.
Luna smiled and put her wand behind her ear.
“It's alright.”
Ginny's eyes moved from bare breast infront of her to Luna's neck.
She was wearing the same collar as Ginny was holding.
“So you were wearing it all the way from your common room?” Ginny asked with hardly hidden surprise.
Luna nodded.
“How does it feel?”
Ginny asked, trying not to sound too curious.
“Liberating.”
“I have one to spare if you want to try.” Luna said.
Ginny shakes her head and blushes.
“No thanks.”

Naked Hermione sits on her bed, her eyes moving from the book to the collar and back.
Even after all she did in the last weeks. This seems too ****.
She couldn't do it could she?

“The collar you are holding will cast a ilusion of clothes. You will wear it and only it. No clothes, no underwear, no shoes and no wand. And you will attend the next quidditch match.”

Hermione read the instruction again.
She felt her heart beat faster as she imagined it.
Next quidditch match was in an hour.
She carefully put the collar on her neck.
Aside from a quiet click when the silver buckle locked it in place she didn't feel anything.
No indication that the spell is working.
Hermione carefully left her bed, and walked in front of a big mirror at the wall.
In it she saw herself, naked wearing only a black collar.
For a few seconds she thought that the spell wasn't working.
She reached for the collar and touched it.
Watching herself in the mirror.
She looked sexy, with the collar and nothing more.
But clearly she couldn't wear it because it wasn't working.
Then someone opened the door.
Hermione frozen.
“Here you are.” Said Levander and looked at Hermione.
“Are you going?” Lavender asked.
Hermione was looking at her, with the mount open in shock.
Why is Levander acting normal? As if Hermione wasn't standing there naked.
Then its hits her.
The spell must work.
Levander must see her wearing clothes.
Hermione looked into the mirror.
Which still showed her wearing her birthday suit.
From where Levander was standing she didn't see the mirror.
Hermione again touched the collar.
“Come on Hermione, your tie is good. Let's go or you will be late.”
Levander said and left the room.
Hermione exhaled and slowly started to walk to the door.
With the last look at her naked form in the mirror she left the bedroom.
Gryffindor common room was almost empty.
Most of the students have already left.
Hermione stopped on top of the stairs and looked down.
No one was paying attention to her.
She started to descend the stairs, when her bare feet touched the stones she shivered.
Not from the cold, but from the new sensation.
Hermione was accustomed to walking barefoot.
But now, wearing nothing but a collar.
Whos spell could stop working anytime and then she would be naked for everyone to see.
Goosebump covered her skin and she subconsciously covered her breast and crotch.
Then she realized she must look really silly in that pose.
Especially if all that people can see is her wearing clothes.
Not knowing they are just an illusion.
Hermione put her hands to her sides and descended into the common room.
Trying to act as normal as possible.
The few Gryffindors who were still there didn't pay attention to her at all.
Suddenly she felt that someone touched her hip.
“Sorry Hermione.” Nevill said as he passed around her.
Hermione froze, even when it was just an accidental touch her mind raced.
Could he feel her skin? Is that ilusion just visual? If he moved slightly to the side he would touch her butt.
“Are you ok?” Neville asked, watching her with a curious look.
“Yes.” Hermione managed to say.
She had trouble processing what just happened.
She stood naked in the middle of Gryffindor common room and was talking to Neville.
And even if he didn't know she was naked, the situation had an effect on her.
“I just,” Hermione continued to talk.
“Did you see Harry and Ron?”
She asked in an attempt to redirect her thoughts from her current situation.
“I think they already left. “
Neville said after a few seconds.
“You know how they are about Quidditch.“
Hermione tried to smile.
“Yeah.”
“Are you going?” Neville asked.
Hermione nodded, and they both left the common room.
As they walked Neville talked about plants but Hermione barely listened to him.
She was frantically looking around, in an attempt to spot if someone noticed her state of undress.
So far every student they pass didn't acknowledge them.
No one seems to see through the ilusion.
Hermione calmed slightly.
This wasn't her first nude walk in the castle.
However now it was daylight and people were around.
Only thing keeping her dignity safe was ilusion spell she didn't know anything about.
“Aaaa.” Someone screamed.
Hermione turned around to locate the source of the scream.
She feared that the illusion broke and now people can see her naked.
She even reached to her neck to check if the collar was still there.
It was, and the scream had nothing to do with Hermione.
Some fourth year student accidently jinxed his friend.
Whos skin was now covered with a ugly looking rash.
“I am sorry.” The culprit tries to apologize.
“Let's go visit Ms.Pomfrey.”
He said and led his jinxed friend away.
Hermione exhaled, still holding the collar.
“You ok?” Neville asked and put his hand on Hermione's shoulder.
She shivered, hoping that he didn't notice.
“You look jumpy.”
“I am ok.” Hermione answer.
She tries to sound confident, but Neville's hand on her shoulder starts to have an effect on her.
She hoped he would move his hand lower.
To her butt, but that didn't happen.
“We should hurry,” Neville said instead and his hand left her shoulder.
Then they continued to the quidditch stadium.