“It starts off small,” Freya explains, “but it gets bigger. Don’t be alarmed!” She smirked, although Emerald could see a hint of anxiety in her eyes.

“I’m sure it does,” she said quickly. “I - I’m sorry, this wasn’t what I thought... I don’t know why, but I had it in my head that it’d just suddenly switch from one to the other. Not, y’know, this slow process...”

“Fair assumption, I guess,” Freya shrugged. “That’s how it works with normal transfiguration, but flux hexes work differently - they need that time to gradually change.” She raised an eyebrow. “I’d’ve thought you’d know that, being so well-read!”

Emerald blushed. “I don’t know everything!”

Freya grinned. “I love it when you blush...”

Shaking her head, Emerald averted her eyes from her girlfriend’s gaze, instead looking down at the slowly growing shape between Freya’s legs. Typical, that she was the one naked from the waist down, and yet it was Emerald who felt exposed and vulnerable. (Not that she was complaining too strongly.)

It was the day of Freya’s changeover - when her cunt vanished and her cock and balls were restored for the week. It sounded like a very private transition, so Emerald was slightly taken aback when Freya invited her to watch the change - or the immediate aftermath, at any rate. She hadn’t seen the actual moment Freya’s cunt disappeared and her original genitalia had begun to grow back, but she was now sitting on Freya’s bed beside her watching her little cock gradually increase in size.

Freya was talking about it very matter-of-factly and seemed unabashed to be sitting with her junk exposed in front of her girlfriend. It wasn’t like it was the first time they’d seen each other naked - it had been over a week since Halloween, and they’d had sex a few more times since that night. But it was the first time Freya had had her dick in front of Emerald, who was not unaware of the significance of that - or of Freya allowing her to watch its restoration. It felt like this marked a new level of intimacy in their relationship. Though Freya seemed unabashed, Emerald thought she knew her well enough by now to sense her nerves. So she was trying to act as normally as possible, to try and reassure her.

Which mostly meant being very easily teased and repeatedly collapsing into a flustered mess.

“So, so how does it feel, when it’s growing back?” she asked.

“Tender.” Freya sighed. “Really tender, and sensitive. I spend as much time as possible on transition days just sitting around in my room like this, letting it breathe!” She sniggered at her own words. “Because even wearing just panties against it is maddening. Not in a bad way, but in a very, very distracting way!”

“Having to go to school like this must drive you nuts,” Emerald remarked, and then giggled. “No pun intended.”

Freya laughed. “Yeah, totally! So hard to focus on schoolwork when all I wanna do is touch myself...”

“And yet you’re still in the top three in our year,” her girlfriend mused, staring at her with a mock-awestruck expression. “How do you do it?”

She smirked. “What can I say? I’m a genius.” She adjusted her position - having been sitting in the middle of the bed with her legs crossed in front of her, like a protective barrier around her dick, she moved forwards and sat on the edge of the bed instead, right next to Emerald. She inhaled sharply as her balls brushed against the duvet, a shudder going through her.

Emerald stared at her wide-eyed. “Wow, you really are sensitive, aren’t you? Have you tried any potions or ointments?”

“A few things, yeah. Some help more than others, but none of them make it go away completely. And they’re pretty expensive, so I save them for days when I need them - I don’t take them on days without classes, like today.”

Emerald nodded. “That’s reasonable. But that means you’re really going through it today, huh? Just sitting here trying to cope with how it feels, trying not to go out of your mind with arousal...”

Freya bit her lip, her cheeks flushing. And was it Emerald’s imagination, or had that little dick just grown a little larger before her eyes? “I’m supposed to be the one who teases you, not the other way round,” Freya mumbled.

Giggling, Emerald stood up. “Well, I do have a bit of dom energy in me, somewhere deep down. Seeing you so vulnerable is stirring it up, but I probably shouldn’t indulge in it while you’re in flux!”

“Smart.”

Emerald crossed to the water cooler in the corner of Freya’s room - a luxury few students had, but she did have to refill it herself by taking the container out to the drinking fountain outside. Refilling her glass, she took a sip and turned back around, to see Freya had raised her hands in front of her face. Emerald gasped as Freya dropped her left hand, discharging a flash of blue from her ring. Within moments, her busy mind had gone wonderfully blank once more.

Freya grinned as Emerald gaped at her, looking dumbstruck with surprise. Which, to be fair, she probably was at first, but the expression had lingered as her mind had rapidly gone clear and empty. (She wasn’t sure, but she strongly suspected the element of surprise sped up the process.) Fuck, Em looked so beautiful like this - dazed and mindless, just waiting to be told what to do...

Freya squirmed against her bedclothes, feeling electric thrills in her cock and balls. This was probably ill-advised. She was already insanely horny without doing anything with her girlfriend. But she’d had a sudden flash of inspiration, and anyway, Emerald had given her full permission to ambush her with the enthralment hex at any time. So she couldn’t resist.

(The day after Halloween, they had talked things through and formed a more definitive picture of what their consensual non-consent relationship would look like. It amounted to Freya being able to control Emerald at any time and do whatever she wanted with her, with only two exceptions. If Freya did something that Emerald later said she didn’t like, they would rule it out permanently for future play. And Emerald could ask not to be enthralled on certain days or for certain longer periods of time, but she obviously had to be proactive and ask when she still had full control of her faculties - because once she’d been ambushed and hexed, she wouldn’t be able to object...)

Freya beckoned to her enthralled girlfriend. “Come over here.”

Still wearing that stupefied expression, and holding her glass of water in her right hand, Emerald complied.

“Set your water down on my bedside table, and get my book for me.” Freya spread her legs wide apart as the thrall did as she was told, returning a moment later with the paperback in her outstretched hand. Taking the book from her, Freya nodded to the floor in front of her. “Kneel down there, looking up at me, and open your mouth nice and wide.” Emerald fell to her knees before Freya and gazed up at her with a gaping mouth and wide, guileless eyes.

Reaching down, Freya placed her hand against the back of Emerald’s head and pushed her forwards, until her mouth reached her genitals. Tucking them inside, Freya gasped and moaned loudly at the wet warmth of Emerald’s tongue on her balls, and her breath on her dick. Her eyes rolling back in her head, she sat shuddering and panting for a few long seconds as she got used to the feeling.

Finally regaining a measure of composure, she gazed tenderly down at Emerald, whose placid eyes still stared back up at her. “I was just thinking, what my cock could really use while it’s growing back... is a cocksleeve. Thank the Goddesses I have one readily available!” She laughed maliciously. “Now, I have some studying to do...”

Opening her book, she rested it on the top of Emerald’s head, using her as a convenient desk. Her face was hidden from Freya’s view - as, of course, Freya’s face had been from Emerald’s. But she knew the entranced submissive would still be staring vacantly up at her through the paperback.

Every so often, Freya’s cock and balls twitched gently and grew a fraction bigger, edging along Emerald’s tongue. Soon her dick was brushing against the roof of Emerald’s mouth. Even when they eventually reached full size they wouldn’t be big enough to obstruct Emerald’s airway - and Freya wasn’t exactly facefucking her, ramming her shaft down the back of her throat. At least, not yet... there would be plenty of time for that this week. For now, she was just using her as a cocksleeve and a reading desk.

It was, admittedly, very hard to focus on reading, with her intensely tender dick inside her girlfriend’s warm mouth. But Freya forced herself to concentrate. After all, it was very important study material.

The book was entitled Kink and the Enthralment Hex. And she’d reached a chapter that had particularly grasped her attention: Playing with Runes.