"Come in Miss Evans" Professor McGonagall said, her Scottish accent echoing down the stone halls of Hogwarts as she looked down at the Head Girl, who was sitting waiting for her on one of the seats placed outside of her office.
Lily stood up and followed her favourite teacher into her office before stopping at a respectful distance in front of the deputy headmistress' desk while the woman herself took a seat behind it.
"Do you know why I've asked you to come and see me today?" she asked the girl in front of her once she had made herself comfortable in her chair.
"No miss" she replied shaking her head. Lily was beginning to worry, she knew that she was one of McGonagall's favourite students and the woman didn't usually use such a formal tone with her. It was the same one that she had heard her use countless times with her less rule following fellow students.
"I've received a couple of complaints now about your behaviour towards some of the younger students. I hear that you have been using corporal punishment on the lower years for things like being too loud in your house common room." she said as the young lady before her started playing with her hair nervously.
"It is against the rules though" she attempted to justify her actions.
"I know, but such infractions are usually dealt with with a deduction in house points, not a spanking so hard that the children are using their pocket money to buy healing salves from the older students."
Lily looked down at the ground.
"While minor infractions do not usually earn a sore bottom, prefects and the head boys and girls abusing the power that they have been given is a very serious offence." she frowned at the girl.
"I'm sure that you know the punishment for the more serious offenses is always a sound spanking young lady?" she continued, staring at the girl who squirmed under her gaze.
"Yes miss" she replied.
"In that case there's no use dilly-dallying, lift up your skirt." the teacher said as she sat on a newly conjured chair in the middle of her office.
Lily dithered for a few seconds but eventually did as her teacher told her, revealing her pale legs and white school uniform knickers to the older woman.
McGonagall was surprised. By the time that most girls had reached their final year at Hogwarts they had long stopped wearing the the white panties demanded by the school dress code. At least she didn't have to add more swats to what was already going to be a painful spanking for breaking more regulations.
After a brief pause designed to make the girl squirm, the teacher pulled her student over her knees.
The gravity of the situation finally came to Lily as she felt her teacher's lap dig in to her slightly and her face hovered about a foot from the old fashioned carpet of Professor McGonagall's office floor.
While the girl looked down at the floor, McGonagall looked down at the bottom across her lap. Four pink marks could be seen jutting out from beneath her school knickers.
She pulled up one of the leg openings of her student's knickers for a better view and noticed a pale pink handprint on her student's backside.
"James Potter's handiwork I assume" she said as she traced the outsides of the handprint with her finger.
Lily blushed bright red, she had forgotten all about it after her boyfriend had given her a parting smack after a snogging session in one of Hogwarts' many broom cupboards.
McGonagall released the elasticated opening and it flew back into place with a barely audible snap.
It didn't really hurt but Lily winced nethertheless as she knew from experience that her punishment would begin soon.
She didn't have to wait long.
SMACK! SMACK! SMACK! SMACK! SMACK! SMACK! SMACK! SMACK!
McGonagall began the spanking as she meant for it to go on, with a furious storm of smacks, each one landing on the opposite cheek from the one before it.
Lily could do nothing but gasp in shock at the force of the blows and her mind refused to think about anything other than the growing pain in her bottom and about how bad it would soon be. She was helpless to prevent her fate and could only look down at her teacher's floor and at her hands, which were pushing against the carpet in order to keep her face from crashing into it. She couldn't even see much of the floor because her long, red hair had fallen forward and was blocking her view.
SMACK! SMACK! SMACK! SMACK! SMACK! SMACK! SMACK! SMACK! SMACK! SMACK! SMACK! SMACK! SMACK! SMACK! SMACK! SMACK!
The professor continued at her steady, yet swift, pace. She alternated cheeks with each smack and focussed most on the bottom of her student's backside which the girl's knickers did not cover and where she could see the damage that she was doing.
"It'll be over soon, it won't be too bad" Lily thought to herself as the pain in her rear end grew. She knew it was a lie though and she was too experienced in both receiving a spanking from McGonagall, though she had only ever been forced to endure a few when she was younger and had avoided trouble in the past few years, and in giving them to punish misbehaving students to convince herself.
SMACK! SMACK! SMACK! SMACK! SMACK! SMACK! SMACK! SMACK! SMACK! SMACK! SMACK! SMACK! SMACK! SMACK! SMACK! SMACK!
McGonagall's hand began to hurt a bit as the spanking progressed but she continued despite it. Lily was one of her favourite students and she was determined to teach her a valuable lesson.
The girl also felt pain, though in a different area. She too was determined to endure it with as much dignity as she could, although that was becoming more and more difficult with each swat that smacked loudly against her behind.
SMACK! SMACK! SMACK! SMACK! SMACK! SMACK! SMACK! SMACK! SMACK! SMACK! SMACK! SMACK! SMACK! SMACK! SMACK! SMACK!
After the latest series of swats, McGonagall paused. She grabbed the waistband of the girl's knickers and pulled them half way down her thighs with a single pull, revealing the punished bottom below. She ignored her student's protests as she surveyed the now uncovered rear end.
"No, please professor" Lily squeaked when her bottom's thin cotton protection was ripped away. When her teacher stopped she had allowed herself to believe that her ordeal had come to a close but her hopes, like her knickers, lowered quickly.
SMACK! SMACK! SMACK! SMACK! SMACK! SMACK! SMACK! SMACK! SMACK! SMACK! SMACK! SMACK!
The teacher's final dozen swats were her hardest yet, she used them on the area's of the girl's rear end that she had missed when her knickers were covering her target area.
Lily remained passive while the professor delivered her final swats, though with great difficulty and with her jaw clenched to stop herself from crying out because of her stinging behind.
"Stand up Lily and bend over my desk" the teacher ordered.
The girl obeyed her silently and lifted herself of the woman's lap quickly.
"Hold your skirt up" McGonagall continued after she was stood straight and it had fallen down to it's correct position.
She complied with that order as well and McGonagall watched as her student shuffled over to her desk as knickers fell further and further down her legs.
Once she was bent over the desk, her teacher spoke again.
"You are seventeen now aren't you?" she said.
"Yes miss" Lily said meekly after a short pause. She had considered lying to try and get a less severe punishment but she was sure that her teacher would know.
"In that case, it will be seventeen strokes of the strap for you. After that we will see if you've learned your lesson" she said as she walked over to one of the cabinets which lined the lower parts of the left side of her room, the rest of the space being taken up by windows, which had been thrown open because of the summer heat.
She opened one of the cabinets and surveyed its contents. It didn't contain much, just a sturdy wooden brush to keep the younger students in line and a selection of three tawses in sizes medium, heavy and extra heavy.
Her hand hovered over them as she considered which implement to use, the particularly menacing looking extra heavy tawse was out straight away, it was strictly only used on boys. Her hand moved so that it was over the lighter ones, she didn't want the girl to be back over her desk in a week having not learned her lesson but she was one of her favourites and she didn't want to cause too much pain.
"I'm sure the medium will teach her not to abuse her powers perfectly well" she thought as she picked it up and walked back over to the naughty girl.
Lily whimpered when she saw her teacher approach her with the strap. She had seen the results of the heavy strap on some of her friends though, so she was a little relieved to see a big M on the end of it.
With a wave of her wand, McGonagall closed all of her office windows. She would have normally left them open so that the child that she was punishing's humiliation increased from their cries of pain being heard by everyone who was in the courtyard below, but she didn't want to ruin her Head Girl's authority.
She watched as her student trembled, though she didn't know how much of that was out of fear and how much was from the cold air that the closing windows had pushed at her bare bottom.
"How many strokes of the strap are you going to receive Miss Evans?" she asked in a formal tone.
"17 professor" she answered, fear making her voice falter on the last word.
"And do you know why you are getting these 17 strokes?" she continued.
"Because I abused my authority and gave harsh spankings for minor offences professor" the girl said, still looking over her shoulder at her teacher.
"Correct" she began to lecture the girl "you are a member of Gryffindor house and we pride ourselves on our bravery and chivalry. Is there anything brave or chivalrous about unjustly disciplining those you have power over?"
"No miss" she answered. Lily's blush grew, she didn't think it was possible to be any more embarrassed but this lecture was worse than baring her private parts before her favourite teacher. Professor McGonagall was the person that she respected most in the wizarding world and disappointing her really hurt. To hide her growing blush she turned her head to look at the teacher's dark wooden desk.
"Exactly, now put your arms forward and hold the end of my desk"
Lily did as she was told and soon she was stretching right across the very large desk.
SMACK!
The teacher brought the strap down hard on the girl's backside as soon as she was lying in the correct position and watched unsmiling as her bottom jiggled from the strike.
"Ouch!" Lily let out a cry as she leather impacted against her defenceless behind. The burning pain made her want to jump high into the air, but she fought against that impulse and stayed in her assigned position.
SMACK! SMACK! SMACK!
McGonagall continued the strapping at a steady pace, leaving about ten seconds between each stroke in order to leave enough time for the girl to suffer the after effects of each stroke.
The girl took the strap well enough, though this was only the beginning and her cries were already louder than the ones given off by students who had more experience with the tool, or one of the professor's heavier implements.
SMACK! SMACK! SMACK!
"No more, please professor!" Lily begged. By the seventh stroke tears were welling in eyes and her behind felt like it was on fire. All of her shame was forgotten as she wiggled her bare rear end and jumped up and down a little.
SMACK! SMACK! SMACK! SMACK!
By the tenth stroke, tears were falling freely down the girl's face and she was crying loudly. She tried to pull her arms away from the desk to rub and sooth her burning bum but they were magically stuck in place. Her cries turned to sobs and she tried to fight against her teacher's sticking charm, desperate to escape.
SMACK!
"No more! Please! I can't take any more!" she begged her teacher after the strap fell upon her bottom for an eleventh time.
McGonagall shook her head but said nothing. She was surprised that her favourite student was taking her strapping so badly, but thinking back she couldn't remember ever giving her one before. She just continued on as if the girl hadn't said anything.
SMACK! SMACK! SMACK! SMACK! SMACK! SMACK!
The teacher finished the spanking at a slower pace, forcing the girl to endure the after effects of the previous stroke against her already bruising behind before delivering the next one.
There was no more begging from Lily, only sobs which grew louder and louder as her strapping progressed.
After she had finished, McGonagall didn't remove her sticking charms right away, she was of the opinion that the pain that her students suffered following their spankings was as much a part of their punishment as the spanking itself.
She finally released the charm when the girl's sobs became just sniffles and allowed her to stand.
"You may let go of your skirt now" she told the girl who was still obeying her teacher's order to hold her skirt up, "I hope that you will never give me a reason to use the strap on you again Miss Evans, did you learn your lesson?"
"Yes miss" she answered, using her hands to clean the remaining tears off of her face now that she didn't have hold up her skirt. After what she had experienced, she too hoped that she was never bent over her teacher's desk again.
"As you may know, the remaining pain in your backside is a part of your punishment. And therefore you are not allowed to use any spells, potions or salves to heal yourself or reduce the pain. As such, you will report to me in this office after dinner for a week so that I can check and ensure that you haven't done so." the teacher said, somehow looking down at her student despite them being the same height. "If I find that you have disobeyed me Miss Evans, we we redo your punishment."
Lily nodded in your response.
"Okay dear, you may redress and leave" she said after a second.
Lily pulled up her underwear and was out in a flash.