The Trials and Tribulations of a Princess in Heat

“SHINING ARMOR!” the cry would have echoed throughout the castle, if the silencing spells on the doors weren’t quite so potent. “SHINY!” the Princess screamed again, “Oh, YES!” The last yell drew on for quite some time, leaving the thankfully hypothetical eavesdropper in no doubt that somepony was thoroughly enjoying Shining Armor’s presence, or at least the thought of it.

Once she has calmed down a little, Twilight Sparkle, Princess of Friendship, would very clearly like to inform the reader that she is not in the habit of visualising her brother when she masturbates. Today was purely a one off, and there were many, many other stallions her imagination could conjure up. Nor had anything indecent ever happened between the two in real life. She’d only seen his erect member twice in her life, both times when she was really too young to understand how important it was, earning each of the siblings a very clear lesson in knocking before entering a room.

But just once, she hadn’t been able to shake that stubborn image from her mind, and then had been too lost in her imagination to care. Maybe she’d only seen it twice, but that was once more than any other stallion, and so this particular fantasy had an edge of realism that wasn’t dulled by a somewhat disappointing memory. Shining was anything but disappointing; she didn’t know if it was just because she’d been so young back then, but the girth she remembered was incredible. She smiled happily as she thought about it, sighed into her pillow, and the pale glow around her horn vanished in happy exhaustion.

She was actually quite proud of herself; very few unicorns had the self control to manage any kind of magic once they were close to the edge. Most mares probably contented themselves with using their hooves. But Twilight had more determination and more magic than most – sometimes it seemed like she had more magic than everyone else she knew – and she could keep her horn lit right until she exploded. It was incredible.

Usually, it was enough to satisfy any urges her body presented her with. Now, however, the princess was in heat, and it seemed that her recent transformation had enhanced her hormones as well as the more obvious changes. Barely an hour later, every breath of breeze across her body was making her shiver with lust, and it was impossible to concentrate on her work.

She had a lot of work to do, some of which involved poring over ancient books. But she couldn’t focus, because her mind took every opportunity to think about sex. Even innocuous words like ‘long’ and ‘hard’ sent her back to thinking about one day when she had been so young, bursting excitedly into Shining’s room to tell him about some particularly amusing fact she’d read and seeing him out of breath, stroking his magnificent–

Twilight Sparkle cut off that thought as soon as she realised she was unthinkingly starting to touch herself again. Was it too much to ask, that a regal princess could go like five minutes without living through memories of her brother’s humongous stallionhood? She told herself she only remembered it being so huge because she’d been so small then. She’d thought it was gross, but what would she have thought if she’d known how important things like that would come to seem once she was grown?

She was sure that if she’d understood back then, she would have been more careful to mind his privacy. She might never even have seen his titanic, throbbing member, and now her fantasies could be filled with healthy, wholesome stallions who she might actually have some chance of fucking. Although all the foresight in the world wouldn’t have stopped her from seeking refuge in a disused storeroom at the library one day when she was a young filly and even the sound of other ponies’ pages turning in the library seemed designed to distract her from her book. She couldn’t have stopped Shining Armor and his marefriend choosing the same room to hide in when their adolescent hormones got too much for them to handle.

It was strange now, she couldn’t even remember if it had been Cadance she’d seen that day, or if Shiny had been with somepony else before. She could remember the force with which her brother had almost thrown her into a room they thought deserted, and then charged forward to claim his prize. She remembered in exquisite detail how surprised she’d been to see his member, throbbing like a living thing, and how her gentle big brother was suddenly powerful and commanding, while still being just as caring as he’d ever been. He’d taken a few moments to realise there was anyone there, and little Twilight had stared in naive confusion at his cock, taking in every detail. She’d wondered in her innocence if it folded up somehow to remain unseen, not knowing how it really worked. She’d been excited then, but hadn’t really understood, and had no opportunity to ask what was going on in the chaos of yelling, anger and apology the twin responses to her confusion.

If she’d known back then how important it was to have a cock inside you, she would probably have bolted straight away so as not to interrupt the two who needed it so much more than she did. Or she might have hunkered down behind a battered crate and watched, unnoticed, learning all her big brother’s little tricks so she could one day teach them to a lover of her own. She never doubted that Shining Armor would know exactly how to please a mare, would do everything right. It was a mixture of the strange power that seemed to take him over and the devoted attention to detail that seemed to rule every part of his life. He’d be strong enough to take control, but gentle enough not to hurt.

Twilight could just imagine how the scene would have played out if Shiny had worried about his little sister’s state of mind after the mare had bolted. He would do the right thing, even if he was still engorged and finding it tough to think. She would have just stared, wondering what this thing was that had so changed his demeanour, and desperate to understand. She would have felt her heart racing as she thought about it, and a little tingle from parts of her body she didn’t yet understand. Nothing like the surge of desire that she felt years later, just from thinking of a scene that had never played out, could never have really happened.

She could imagine it, though. Without a second thought, her horn began to flicker as she applied a gentle vibration to her clit, and then focused on the images in her mind. Sniffing at the unfamiliar part of his body, asking what it was. His embarrassment as he prayed for it to go down, but the shame just returned it to full stiffness and made it bob against his abs. She would have asked if it was some kind of parasite, changing the way he thought. She knew the thought had crossed her mind, as she’d just been reading about such disgusting creatures. But if she’d asked him, she could have got the answer from his own lips instead of looking it up in a medical text the following day. He would have told her that it was a part of him, but that it felt so good when touched that he sometimes forgot himself. And not really understanding, the filly Twilight would have reached out to touch… no, to lick, while her muzzle was already so close, staring without really understanding. Maybe she’d use her magic too, and give his balls a little vibration while she started to suck on his shaft.

He’d try to protest at first, to explain why it wasn’t appropriate. But she hadn’t known back then, and he’d only be able to utter a low moan after a few flicks of her tongue. She kept on going, and he started to thrust harder, knowing what was coming but unable to stop himself. Twilight sucked obliviously, working by instinct but spurred on by the joy in her brother’s voice. She felt his cock flare in her mouth and almost gagged, not knowing what to think. She pulled back, wondering if she’d somehow injured this sensitive part of Shiny’s body, and looked uncomprehendingly at the now-flat tip, and then…

Princess Twilight gasped and screamed as another orgasm shook her body, hooves and magic working in perfect harmony to push her over the edge. For a moment her thoughts settled like white flakes in a snowglobe, and she felt a pang of guilt over satisfying herself before her brother was finished. Even with a figment of her imagination, her instincts were always to be generous.

Her body’s demands satisfied yet again, Twilight started to wonder if she would be better off leaving the castle after all. She had important research to do, but it wasn’t particularly urgent and as long as her thoughts kept drifting back to sex she was making no progress at all. She could always put it off until next month, when she would be able to think clearly. Today, it could be more productive to do something she needed to do in the town. It was still a little early to start preparations for Hearth’s Warming, but she had volunteered to be on the committee organising the celebrations this year.

If she was going to spend next month catching up on her studies, she would have to spend this month talking to all the people who would need to know their roles. With other ponies around, it wouldn’t be possible to lose herself so often. She was starting to realise that abstinence wouldn’t be possible with her newly-enhanced alicorn hormones. But she could still hold off until she’d finished some section of her duties, and treat it like a little reward.

Half an hour of frenzied masturbation later (and thankfully not involving thoughts of her brother), she was finally organised enough to go outside and get some work done. Knowing that she was in public would do wonders for her self-control, surely.

What could possibly go wrong?