In the long halls of Hogwarts walked a young woman by the name of Hermione Granger.  She was in her Gryffindor uniform(minus the robe) the sweater vest, red knee socks, and the skirt (that was now smaller due to a wash issue).  She looked down at her broken wand as she walked thinking to herself 'I'm gonna kill Ron for this one.'  
"ow!" yelled Hermione as she ran into the shoulders of a red headed girl and a blonde girl.  
"watch it!"
"Oh hey we were just talking about you." Said the blonde girl that turned around to reveal she was Luna Lovegood.  
"Oh it is that stupid whore, you think you can talk chew out and humiliate my brother?!"  screamed the red headed girl that was revealed to be Jenny Weasley.   Hermione was shocked to here this and started to walk away.
"Petrificus Totalus!"  yelled Jenny as she shot the spell at Hermione.  Hermione screamed in pain as she hit the ground but her scream was cut short when Luna used Silencio.  
"The spells will ware off soon"
"I know lets take her to the room of requirement " Said Luna with a slight smile on her face.  They lifted her up with the wingardium leviosa spell and took her to the room.  Once there the spell wore off and Hermione started to squirm.
"Incarcerous!" rope shot from jenny's wand and they bound Hermione's legs at the ankles and thighs, her arms in the folded position, and the rope went above and below her boobs (not sure if I described that right :/).  As she went to scream Luna wrapped her mouth in several layer's of Duct tape.
"I love this muggle invention!  It's simple, but affective." said luna as she layered the tape around Hermione's head.
"Defendo!" Yelled jenny, as she did she pointed the wand at Hermione's shirt, then skirt.  The seams then fell apart as she laid there bound and gagged on the cold floor.  She was now in a red bra with the Gryffindor symbol on the right cup red bikini bottom style panties with golden wastebands, and the red knee socks.  
"Wingardium leviosa" jenny used this spell to pick up Hermione by the back of her underwear.  She squealed under the tape as she struggled and squirmed, it was no use, her underwear stretched up to her head and the front past her bellybutton.
"Oh your underwear is stretchy and big, lets change that.   Reducio!"  Luna yelled.  This cause Hermione's panties to shrink down to where they were only past her shoulders and the front shrunk down just below her bellybutton, giving her an instant frontal wedgie.  This did it, Hermione squealed yet again, but this time louder with more purpose.  She was then set down.  Jenny then used Incarcerous to attatch 1 rope between the front leg holes and one between the back.  This gave her bikini style panties a thong look.  They room of requirement then created 2 pulleys.  The two girls hooked the rope on the pulleys that were just in front of and behind the Gryffindor girl.  She knew what happened and began to scream under her gag, but was cut short when the two girls said accio  rope from opposite sides of the room.  She didn't even have time to scream before they cast silencio again.  Once Hermione's feet were 3 feet off the ground the two girls tied the rope on two poles the room create.  Her pussy was sliced into bye the smooth fabric.  These poles had a stretcher crank so that the girls could change the height.  
"lets tether her down."  Luna said as the room created a ring that was welded to the ground just between the girls legs, this ring had a crank next two it that would wrap the rope around it like a spool for thread.  Luna then tied a rope in the middle of Hermione's ankle bonds and pulled down until it reached the ring.  As luna turned the crank Hermione tried wiggled but couldn't make a sound, due to the silencio curse.  
"Accio paddle." Said jenny with a smile on her face.  The 2 girls than began to take turns, hitting Hermione's smooth, round ass 1 time more each turn.  The silencio spell wore off and Hermione once again began to squeal as her ass rippled and turned cherry red.  *Smack* *Smack* *Smack* The room then created a wheel with two paddles on it (the machine from wedgie torture 3)  it spun horizontal to Hermione's ass and smacked it repeatedly.  It started at 100 rpm and increased by 30 every minute.  
"Bye bye Hermione." Said the girls with a smile.  The two then walked out of the room leaving Hermione screaming and cursing under the gag as the spanking machine sped up.  The door then disappeared behind the girls.  
"should we let her out?" asked luna
"no, someone will find her someday"  Jenny said stifling a laugh.

To be continued…