A few days later.

Luna had become something of an addict since discovering her secret spot. Suddenly, all of her previous repressed urges had come into the forefront of her mind. After her first time on the sofa in the common room, she had touched herself to climax a further three times, until she could no longer bear the stimulation. It had not settled down since, requiring masturbation at least twice per day, often more. Almost every single lesson she found herself drifting into a daydream about some boy in the class. It often got untenable, and so - needing to satisfy herself between lessons - she had found some deserted bathrooms where she could go.

This was just such an occasion. Rushing into the abandoned toilet, she locked herself in one of the stalls. Pulling her skirt up and her underwear down, she sat down and began flicking over her favourite spot. Breathing deeply, she relaxed and allowed the incredible pleasure to wash over her. She sped up slightly, causing trickles of liquid to escape - as it always did. A short couple of minutes later, the felt the now familiar build-up of pressure suddenly releasing as she came, hearing the gentle splash as she leaked into the toilet. Having had some practice now, she was getting better at controlling herself and riding out her orgasm for as long as possible. A full ten seconds passed between the start and end of her climax. Breathing in deeply, she rested her hand on her sticky pussy for a moment until she recovered.

She pulled her underwear back up, enjoying the sensation of them being wetted by her orgasm. She flushed the toilet, washed her hands, and exited the bathroom - colliding with Cho.

"Luna! Where have you been?"

"Um... peeing? What do you think?"

"Yeah, sorry. Anyway, I was waiting to walk back to the common room with you?"

"That would be lovely!"

Turning down a secluded corridor, a shortcut few students knew, Cho suddenly broke the slightly tense silence.

"Luna, can I ask something?"

"Of course."

"I.. um... a little embarrassed..."

"It's okay, you can talk to me."

Cho went slightly red and looked away.

"I think I'm having... feelings. Sexual ones..."

"Oh! That's not what I thought you were going to say at all!"

"What were you expecting?"

"Perhaps something about a test?"

"Oh. Sorry, I shouldn't-"

"No, no, it's alright, really. What did you want to ask?"

"I'm not sure what to do about... these feelings."

"Do you feel yourself drifting off in class and fixating on boys? And getting hot and wet... down there?"

Luna felt herself do exactly that as she imagined her friend squirming in class.

"Um..." she blushed. "Yeah... do you?"

"Yeah all the time!"

"And... if you don't mind me asking... what do you... do?"

Both girls felt the tension increase as they edged closer and closer to the boundary of their friendship.

"Well, masturbate, of course!" Luna replied, matter-of-factly.

"Oh. I, um-"

"I have absolutely no idea if it's something we're supposed to do, but it feels so good! I can barely stop myself sometimes! I imagine everyone's probably doing it. The boys, too."

Completely taken aback by Luna's openness on an incredibly awkward topic, Cho simply said: "I guess so."

"It's why I've started wearing my skirt a little higher - had you noticed? To give people a better view."

Glancing down at Luna's beautifully formed arse, Cho did have to admit it was a shocking change from the prudish nerd she had imagined Luna to be.

"Are you... a virgin?" She whispered the last word, irrationally worried that someone might overhear.

"Oh yes," replied Luna, "I'm not ready for a relationship - I'm not sure anyone would want me anyway. I'm very uncool. But I do like the idea of someone busting a nut while they think of me."

"Luna, that's so... so..."

"So?"

"I've never really thought about any of this. Are people really obsessed with... sex?"

Under his new invisibility cloak, Harry moved his fist rapidly up and down his penis as he watched Cho and Luna's behinds as they walked in front of him. Hearing the girls talk so matter-of-factly sent him absolutely wild with lust. He imagined both of them fully naked in bed, moaning as they touched themselves. Thinking about the look on Luna's face as she came, Harry kept watching and stopped walking, desperate not to get caught. Fully clothed, bar lowering his trousers and boxers to thigh height, he concentrated on the sensations in his privates, feeling everything tighten as he neared orgasm. He focussed his mind, desperate to see a girl naked for real. His balls tightened, and his penis became saturated with sensation. Grunting under the strain of holding his breath, he let out a tiny splatter of cum. One, then a second little drop of spunk falling onto the stone floor.

Temporarily relieved, Harry pulled his trousers and pants back up and headed off to class.

"Where have you been? You're nearly late!" Hermione whispered as he sat beside her at the back of the class.

"Peeing, where do you think?"

"Sorry I asked."

The class began and the students set about making their potions. Five minutes later, Harry excused himself to go to the bathroom. Hermione eyed him suspiciously, but didn't say anything until he came back.

"You're doing it in class now?"

"No, that was a genuine toilet break. Anyway, why do you care?"

"I don't." She shrugged. "What about your toilet break earlier?"

"..."

"Oh my god! What if someone noticed?"

"I used my invisibility cloak."

"You were in public?"

"There were a couple of girls..."

"Harry! You can't go around spying on people! That's gross!"

"I know, I see that now. But in the moment, I..."

"You didn't...!?"

"..."

"Oh my god!"

"I know. Sorry."

"Well, the good news for you is that I did some reading, and it turns out that our... problem... can be solved."

"You said it couldn't!"

"I know. Because I was nervous. But I can't have you getting expelled because you're horny. There's a spell."

"That stops us feeling like we need to... you know. All the time."

"Not quite. It bonds us together. So we feel each other's... um... stuff as well as our own."

"And how does that help?"

"It means we get the relief when we can't do it ourselves."

"I see. And you want to try it?"

"Why not. I have needs too."

"Okay, let's do it."

Hermione took a scrap of parchment from her robes and muttered the spell she'd scribbled there. Immediately they felt the warm glow of arousal and sighed, trying to avoid eye contact.

"Did it work?" Asked Harry.

"I think so, yeah."

"How do we know?"

Hermione slyly slipped her right hand beneath her robe, then down the front of her skirt. Quickly averting his eyes to the front of the room, Harry began to feel an enjoyable, intense tingling around the tip of his erect cock.

"Oh!" A gasp escaped both their mouths.

"I think it works, Hermione!"

"Yeah, this is working!" She picked up the pace, sending waves of pleasure through both of them.

"We don't have to do this now, I only just…" Harry grunted, feeling the warmth spread across his body.

"I need this…" came a very breathy response.

Several minutes of panting, sweating, and Harry gripping the table as Hermione did unspeakable things to herself passed, until eventually Harry saw her spread her legs slightly, increase her pace again, and take a deep breath as they simultaneously climaxed. Quickly slamming their legs together, Hermione let out a stifled gasp of surprise as she strummed herself, drawing out their orgasms until she could no longer bear the touch.

Both red in the face, anxiously looking around the room to make sure no one noticed, they caught their breath.

"I'd better go clean up. Again," Harry whispered.

"Uh, Harry?" A nervous look on her face.

"Yeah?"

"Look!" She showed him her hand; it was covered in the thick, white cum that plagued Harry's nights.

"That's…" he began.

"Yeah."

"How?" He felt down his trousers: almost completely dry, save for a small amount of clear, sticky fluid.

"I don't know. I need to… clean up, I guess."

Rising, she left for the toilet, leaving an equally confused and aroused Harry.

Closing the stall door, Hermione pulled down her skirt and panties to her knees. Grabbing a handful of toilet roll, she cleaned her hand and looked down curiously at her semen-soaked underwear. She was a little bit impressed; she'd covered her fingers, all over her privates, and saturated her cotton panties - leaving a puddle on the surface and thick strands connecting her pussy with her knickers. A pretty big load - especially for a girl! Beginning to tidy up, she felt a familiar sensation emanating from her erect clit. Harry wasn't serious!? Already! There was nothing she could do. Maybe this spell wasn't the good idea her teenaged, hormone-addled brain had led her to believe. Standing in the stall with one hand on her hip and one hand trying to clean her underwear, she blushed and breathed deeply as her young body was molested from afar. Nearing orgasm again, she moaned to herself and wondered what was going to happen when she came. Preparing for the worst, she got some fresh tissue and held it in place against her entrance - spreading her lips with her other hand. Soon, her legs started shaking and her breathing became short as another orgasm washed over her gorgeous body, her vagina contracted and began pumping out what felt like gallons of syrupy, ropy cum. Spasming and thrusting her hips for a few seconds, her climax was short-lived, but enjoyable. Regaining herself, she removed the tissue and sure enough - it was coated with spunk.

Still confused, she cleaned herself up again, pulled her still-sticky panties back on - and headed straight for the library. This was far more important than potions.