While the cramps caused by the soapy water were quite painful, the way she was penetrating her was generating something similar to arousal.

She felt violated by that nozzle inside her ass, and the embarrassment of receiving it under the eyes of someone other than her sister was terrible.

It wasn't the first time she had been given an enema, but this time was different. She didn't even know what was happening to her, but what she felt was certainly the beginning of arousal, confirmed by the fact that she was getting wet!

Silvia, perhaps aware of all this, brought her back down to earth and after about a minute, which seemed like an eternity to her, freed her, removing that object from her bottom.

Once free from the two women, Giulia quickly got up from the bed and, without even getting dressed, ran to the bathroom next to the bedroom.

While Giulia wasn't sure whether the sensation she felt was arousal or not, Floriana was certain that she was extremely aroused!

Being an active spectator of that punishment had given her a thrill she had rarely experienced before, and she couldn't wait to turn it into pure pleasure.

She wanted to escape to her room and be alone, but at the same time she wanted to make sure that this 18-year-old girl, the same age as many of her students, received the most appropriate punishment.

She believed that a good old-fashioned spanking always had a corrective effect, so once she got up from the bed where she had been sitting to hold Giulia down during the enemas, she tried to convince her friend of the effectiveness of old-fashioned punishment.

Silvia, who was not very knowledgeable on the subject, listened to her friend's reasons with great interest.

In fact, even though she knew what it was, she had never used it with Giulia, perhaps thinking that punishing unruly girls was more of a parental role.

But in fact, just as she believed that certain medical practices could be turned into punishments, as had just happened, a good spanking would perhaps have been the right conclusion to that afternoon of discipline.

Floriana, now satisfied with her brief conversation with Silvia, wanted to retire to her room, right next to Giulia's, at all costs. Not wanting to interfere further in the matters between the two sisters, she used the excuse of wanting to rest a little before going to the beach.

After receiving Silvia's thanks, she headed for the door, but just before leaving the room, Floriana picked up that familiar object that was lying on the dresser right next to the two women.

It was a wooden hairbrush with a tapered handle and a flat back.

It was Giulia's hairbrush, but Floriana knew well what the second use of that seemingly harmless object was.

A few years earlier, a boy with some strange passions had used it on her bare bottom for an erotic game!

How she would have loved to use it on Giulia's bottom!

She still remembered how it burned on her bare bottom, and once she had picked it up, she looked at her friend with a mischievous smile and, tapping it a couple of times on the palm of her hand, said:

“Make sure you make the right choice!”

Silvia smiled and told her not to worry.

She had just entered her room when she heard Giulia come out of the bathroom and return to her sister's room.

Poor thing, she would never have imagined while she was in the bathroom getting rid of those enemas that the two girls older than her were discussing how to punish her further!

Just as she took off her dress and was left in her swimsuit, Floriana began to hear her two sisters arguing rather heatedly. Thanks to the proximity of the two rooms and perhaps the rather thin walls, she could understand that Silvia was really intent on spanking her unruly sister.

Her advice had worked, and the idea that the girl would soon be spanked was driving her crazy.

She couldn't resist a second longer and put her ear to the wall.

Silvia was immediately clear with her sister. In fact, as soon as she returned to her room, she didn't waste a second in telling her what she thought of her.

Giulia, still a little shaken by what had just happened, didn't even have time to put her panties back on before she found herself standing in front of her sister, who was sitting on the bed with a serious look on her face, ready to give her a good telling-off.

Silvia was threatening to tell their parents everything, including all the other times they hadn't noticed any of her countless mischiefs.

She couldn't believe her ears. Her sister was treating her like a child, but worse still, she was putting her at a crossroads, forcing her to choose between being shamed in front of her parents or being spanked.

Floriana couldn't believe her ears either!

As was only right in situations like this, Viola was explaining to her unruly sister why a punishment was more than deserved, naturally provoking the young girl’s protests.

But Silvia would not listen to reason. She was going to punish her.

Giulia’s pleas, of course, were not long in coming, but they had very little effect. After only a few moments, Floriana heard the fateful sentence—one that excited her so much—spoken by her friend herself.

“Come on, Giulia, get on my lap!”

Those words were like an electric shock.

She wanted to see the scene, but at the same time she couldn't resist any longer and with a quick gesture she took off the bottom of her swimsuit, leaving herself half-naked, free to give in to pleasure.

Her right hand ended up between her legs in no time, and as she continued to stand against the wall to enjoy every moment, her fingers began to touch her private parts.

With almost perfect timing, her finger rested on her clitoris just as the first blow landed on Giulia's bottom.

Silvia had never spanked anyone before that day, but she had certainly watched a few videos on the subject, given how she was administering that punishment to her sister.

The blows were strong and decisive, one per buttock, at a pace that prevented the poor girl from resisting for more than a few moments without complaining.

Her young bottom was becoming redder with each swats, and the burning sensation was becoming increasingly difficult to bear. Each blow was accompanied by a small moan of pain. It was a pain she had never felt before, in a situation that was completely new to her and extremely embarrassing.

Silvia's spankings became stronger and more painful, increasingly difficult to bear, and her moans turned into pleas.

“Silvia, please stop! It burns! Stop!”

Giulia screamed, writhing and kicking her legs.

But Silvia, heedless of her sister's protests, continued undeterred to punish her, delivering blow after blow to her poor buttocks, reminding the unfortunate girl in a serious voice why she was receiving this severe and unexpected punishment.

She was determined to give her a severe punishment and was certainly not going to stop now in the face of the first protests and attempts to break free. So, to prevent her sister from moving, she pinned her legs with her own and held her wrist behind her back, preventing her from rebelling, just as she had seen done in some films about English discipline.

Giulia felt completely at Silvia's mercy, and the worst, despite herself, was yet to come.

She felt her sister pause for a moment, but she knew deep down that this would not be the end, and in fact, out of the corner of her eye, she saw her grab what she imagined would be a very painful instrument.

In a second, Silvia had grabbed her hairbrush.

Floriana was enjoying and imagining every single moment as she stood there without panties, her ear pressed against the wall.

With her legs slightly apart, she gently ran her fingers over her now swollen and wet clitoris, occasionally slipping a finger inside.

She wanted to savor that moment as much as possible, imagining that unruly little girl being punished properly on her sister's lap, and finally, that long-awaited moment arrived.

She heard Giulia exclaim those words that literally drove her crazy.

“Silvia, no! Not the hairbrush, please!”

Her friend had listened to her advice and knew that Giulia's complaints and screams would soon become much more insistent.

She couldn't resist any longer, so she lay down on the bed, which fortunately was right against the wall dividing the two rooms. The time had come to enjoy herself. How many times had she masturbated thinking about girls being severely punished!

Silvia had begun to strike the poor, burning bottom mercilessly, sinking a blow into each buttock with extreme regularity.

She certainly wasn't going to stop at her sister's pleas, who was now doing nothing but screaming with every blow, sobbing with pain and shame. Inside, she counted the swats, which she had decided would be at least fifty.

Giulia's cries mixed with the sound of the wood hitting her poor buttocks were music to Floriana's ears. She was lying on her back on the bed, her legs spread wide apart, listening and touching her perfectly shaved and shamefully open vagina with her hand.

She knew that unfortunately the show would not last much longer, given the number of blows Giulia had already received!

So she closed her eyes and imagined that she was the one with that young ass at her disposal, how much fun she would have...

She could no longer resist and began to masturbate more and more intensely. With the fingers of one hand, she spread her vaginal lips wide open to completely expose her now red and swollen clitoris, while with the other she began to massage it gently.

What had been sighs began to turn into real moans of pleasure, which increased as the clitoral massage intensified.

Those moans of pleasure mingled in unison in the air with the cries of pain from the girl in the next room.

She could see that image again before her eyes— Silvia penetrating Giulia's buttocks with that big enema!

Those perverse and vivid thoughts began to generate intense shivers of pleasure that exploded into a wonderful and powerful orgasm, making her scream with pleasure until she could no longer hear what was happening beyond that wall.

Shocks of pleasure ran through her body for several seconds and then slowly slowed down, allowing her breathing to return to normal.

There were no more complaints coming from Giulia's room, and the only thing she heard was the sound of the door closing.

She lay on her back in bed, her legs still spread apart, thinking about that 18-year-old girl, probably also lying on her bed, but with a red and sore bottom.

She thought about the punishment that had just taken place, which she had been lucky enough to be part of, hoping it wouldn't be the last.

Hoping that Giulia would come home drunk again, looking for another punishment the next day.