Author's Notes:

Contains: accidental incest, sex-enhancing magic, kissing, cunnilingus, first time, vaginal, estrus sex, creampie directly in womb, panic on verge of unstoppable climax, extremely powerful mutual orgasm

And like all the signs were saying, this was bound to happen...

Twilight Sparkle stared at the enchanted mask floating in front of her face as she chewed on her bottom lip.

Standing there in the little entry room before stepping into the room she was about to enter and meet her lover in, make love with him for the first time and they would leave knowing who each other was, she felt herself tremble with nervous anticipation. The white light was on and it was time. Even though they had agreed on the plan, the fact she was about to walk in there and share her first time with her mystery stallion was sending delicious tingles all over her body.

If it wasn’t enough just to have everything else going so perfectly, she was lucky enough that she would get to feel him inside her for the first time when she was in the middle of her estrus cycle. Most of the time, a few spells and some herbal tea were all she made use of, just dealing with the remaining discomfort.

Yet on this day, she was panting, feeling her marehood quiver almost to the point of abdominal cramps, now that she’d removed the reduction spells. She had made sure to have a full set of contraceptive spells cast on her by the Blind Date staff physician before stepping into the entry room. She winced a little at a brief cramp, actually relishing the complete lack of mitigating herbs or spells and facing no statistically viable risk of getting impregnated by her lover, though she certainly let herself enjoy the ‘what if’ idea of it. She knew she was going to have her fires quenched as nature intended at last, and on her very first time with a stallion, on top of it. Most mares dream of getting to have it all perfect, and here she was getting to make that fantasy into a real thing.

Twilight wasn’t sure how she was going to reward him for helping her do this just yet, but she’d think of something. Possibly something involving making him orgasm repeatedly, but something.

And although it took a bit of extra study late at night, Twilight had come prepared with some spells she planned to cast on the two of them. She expected he was going to enjoy what she was going to use as she slipped the mask over her face.

Shining Armor would have never admitted it out loud, but he was nervous as he stared at the hovering mask before him. And for more things than he would have expected as he glanced at the white light telling him she was ready with trepidation.

Several weeks of meeting with his mysterious mare had gone so incredibly well. She was smart, funny, had an adorable personality and could be so imaginative… Yet he didn’t know her face.

Ever since realizing he had begun to fall in love with her, that simple fact frustrated him more with every passing day. He needed to look at her, see her eyes light up when she smiled for him, feel her body against his own as he held her tight. He realized if she hadn’t asked if they could reveal themselves when she did, he would have.

Then there was the issue of realizing his mysterious mare meant the same to him as his best friend, Cadence. It had been a staggering realization for him, suddenly understanding his feelings for the Princess of Love because of developing feelings for his unknown mare. Cadence had even begun to wear a look split between happy and sad when she thought he wasn’t looking. Shining supposed it made sense if she could detect his love for her had grown, while he was also feeling a growing love for another. They hadn’t talked about it yet, but he could feel that day was coming soon. If for nothing else, he had to talk to Cadence because he needed to be honest with his best friend. Maybe I could talk to Twiley about it. She’s not much for romance, focused on her studies like she is, but it might help to have a more logical outside perspective for how to talk to both of the mares I’m in love with.

With the rest of his thoughts, he wasn’t all that worried about how well he could perform for his mysterious mare. His previous efforts had usually been well received, and he planned to pretty much worship her body today. Stallions like himself were relatively easy to please, so he could set aside the need throbbing beneath him. He wanted to make her call out his name as he made her peak with his cock deep inside her marehood, filling her with his seed in the middle of her estrus. Making her first time unforgettable was his sole mission right now. They could spend the rest of the day later doing all the exploring they wanted, but she was first for this first time.

He stretched his neck, feeling a special kind of nervous excitement over getting to know his mystery mare on several new levels, and slipped on the mask.

Both ponies could hear each other breathing after the entry doors shut behind them. Both breathed a bit faster as the anticipation of finally getting full access to each other was becoming reality at last. Both of their masks giving them general outlines of the room’s shape so they could focus on each other, rather than where an unseen bed might lay. It was only going to stay active for five minutes, then leave them both in total blindness as normal.

Shining called out to his mystery mare, his voice a little tense as he began to catch her estrus-drenched scent in a big way, making his cock throb in anticipation. “Hey there, sexy… Are you doing alright and still feel ready for this? How’s my voice today?”

Twilight let out a husky laugh, her tail waving about and quite intentionally fanning her heated scent into the air of the closed room. She wanted him to know how ready she was to have him inside her. Staring at the vague outline of her mystery stallion, a nice virile stallion she knew was going to completely ravish her oh so very soon. A shiver ran down her spine as she realized that actually wouldn’t be enough, she wanted her marehood absolutely wrecked by the time they were done. She licked her lips and gave him a predatory grin he wouldn’t be able to see. “Mmm… You have a nice throaty baritone this time. And I feel comfortable enough to admit I’m tempted to jump at you and just take you on the floor. I’ve never dealt with my estrus without any reducers before. You going to make sure to put my fire out, mister firepony~?”

Shining gave her a heated chuckle, his grin widening as he stepped towards her mostly hidden form. He stopped just before they touched, feeling her breath brush his muzzle as his head came to a stop almost beside hers. “Firepony, huh? Well, I’m sure I can put my hose right where you’re burning the hottest and pump enough inside you to do the job… Before I forget and get lost in your scent and body though, what was the surprise you wanted to do first?”

She let out a happy sigh at his dedication to things she asked of him, nuzzling against the side of his face before pulling back. It was tempting to forget everything but touching him right now. “Not too much. Will you let me cast some sex spells on you before we get started?”

“I… I guess I can agree to that. What did you have in mind?”

Biting her lip for a moment, Twilight just said it all at once. “First, I want to cast a spell that initially makes your semen production increase by a factor of ten or more, as well as activating after climax to make you recover a lot faster, so you can get back in action almost immediately. Then, a spell for both of us that will align the opening of my cervix with your urethra when you’re about to ejaculate, letting you send everything straight into my uterus. Second for both of us is a spell that will be keyed to the same trigger, keeping my hind legs bound around you and yours in place when you get fully hilted and climax inside me.”

Twilight panted as she pressed her nose roughly against her mystery stallion’s own. “For just me is a spell that will keep all of your seed deep inside me. I want it all, stallion. Spray your seed in my womb so I can feel stuffed so full with so much of you inside me that my belly looks swollen with your foal and not one single drop will escape until I’m ready for a new batch.”

For his end, Shining was a little stunned, but it was unbelievably hot the way she growled about keeping his cum locked inside her. He really only had one answer after that. “Honey, cast your spells. Because by the time we’re through, you’ll be struggling to walk for the next month.”

“I hope that’s a promise, stallion.” Twilight said in a low sultry voice as she pulled back. It was difficult to focus while he was touching her and she didn’t want to get the spells wrong. While they weren’t all that difficult, she wasn’t the most clear-headed with how turned on she was. She was glad she hadn’t opted to cast her own contraceptive spells for the same reason. Those were actually quite intricate and not worth risking a mistake.

Then again, if it wasn’t for blunt reality of it being a genuinely bad idea for both of them, she likely would have dispelled all of their protection by this point. If nothing else stopped her, she’d also never break his trust like that, knowing they already agreed not to take any risks in her actually getting pregnant. Despite knowing it was only her estrus messing with her head, she craved the idea of letting him give her a foal. A swollen womb full of the seed he pumped inside her was the closest she could get today.

With the spells cast, she stalked forward with a purr, rubbing the side of her face against his neck as she pressed into him, his scent making her feel a little dizzy now that she didn’t have to resist the urges anymore. She felt and heard him panting as she nuzzled her way up to his ear and gave him a throaty whisper. “Remove our blindfolds when you’re just about to cum so I can look into your eyes, see you for the first time as you tell me you love me and fill me with your love… Otherwise, you may do with me as you will…”

Shining growled as let a shudder run down the length of his spine before he nipped her neck just behind the corner of her jaw, hearing her gasp in response. He lifted her in his magic and set her down on the middle of the bed’s outline on her back. She wasn’t going to be moving away from that spot again for a while if he had anything to say about it.

He saw the outline of her head turned in his direction, seeing the vague image of her hind legs trembling and spreading as he neared. The time for words was over. Her scent was saturating the room now, making his thoughts hazy with need for her. There was just one thing to do first.

His face neared her marehood right as the outline enchantment faded out and left him entirely blind again. Needing only touch and scent to guide him at this point, he could feel the heat of her body radiating as he followed his nose and that heat until he bumped into her marehood, hearing her let out a shaky gasp as his muzzle made contact. A deep inhale right at her core made him hungry.

It was an opportunity he couldn’t pass up, his tongue slipping out and starting to trace her outer folds. They were swollen with her estrus and arousal. The taste of her seemed sharper than usual, the flavor of her estrus making his mouth water. Her whimpers quickly became moans as he gave her a firm lap right between her folds and flicked his tongue off her clit.

Using what he’d learned from her already, he nibbled her soaking marehood and made her writhe against the bed. When her folds winked, he swiped his tongue over her clit and drew out a squeak from his mystery mare. Soon enough, his hooves had her spread open as he slid his tongue around inside her, feeling her forehooves on his head and holding him against her, trying to grind herself against his tongue.

Twilight couldn’t take it anymore and pulled her mystery stallion up over her body, feeling his mouth slip away from her quivering entrance that needed something else now. He took the hint and let her lead him. When he paused at the right position, she was about to practically demand he rut her, but his lips connected with hers and silenced her voice as she whined.

She felt his cock rubbing against her stomach, again getting ready to speak when he shifted his body and touched his tip against her burning entrance before breaking the kiss. Twilight felt him pause as her anticipation built, then slowly began to push his flare against her folds, feeling herself starting to spread open for him.

A low groan escaped them both as the tip of his cock finally entered her most sacred of places at long last. Pulling him forward in her need, her mouth opened in a silent exclamation as his length slowly sank farther and farther inside her wanting body. A gasp escaped as his medial ring slipped into her sensitive core, her sopping folds were so ready there was no resistance to slow his progress.

When she felt him sink inside to the hilt, at the same time his tip grazed the entrance of her womb, she found herself struggling to breathe. Her plot was one thing, but her marehood was far more sensitive under normal arousal. Her estrus-stricken body kept trying to tug him further inside as her inner muscles winked against him over and over. His lips stole her breath away as he held himself fully inside for the first time, both of them savoring their shared new connection. She lashed his tongue with her own as her legs wrapped around him, almost torn on keeping him so deep inside her versus letting him start to thrust.

The choice was soon settled as she felt him slowly draw back, then begin to thrust back inside her, scraping at her already sensitive nerves. She marveled at the feel of his flare sliding through her core, able to feel the position of it so clearly with each thrust. His medial ring made her gasp every time it slipped back into her body.

Shining panted from the feel of his mystery mare clenching around his cock, feeling her winking passage constantly trying to coax him back inside to the hilt. When he had first slipped fully inside her, it felt like her marehood was almost trying to swallow him like her throat, letting him know exactly how much she wanted him to pour himself inside her.

Each time he drew back for another thrust, it felt like he couldn’t let quite as much of his shaft slip out as the previous time, feeling a growing need to stay buried as deep inside of her as he could. He had started with slow thrusts, but now he was following a steady rhythm. By the time he was only drawing back just far enough for his medial ring to slip free, then thrusting fully back inside, she was whimpering as she tried to meet his every thrust. He began following the lead of her clenching tunnel a bit more, trying to pull back when she squeezed to get him deeper, then thrust back in as she relaxed and her inner resistance was down, which frequently drew a out breathy squeak from getting stuffed the moment she relaxed.

Soon, he was hardly pulling back as he thrust as deep as he could inside her overheated body, feeling her tugging at him with her legs and her marehood, begging for more as he ground against her with firm pressure. Frantic kisses and the rising tension in both their bodies told them both their lovemaking was bringing them close.

Twilight was wondering how he could cause such pleasure when she felt him starting to flare at last, clinging to her stallion in desperate need. It felt like she was climaxing already with how good it all felt because of her estrus, but she knew she was still only building up. And knowing he was getting close himself, she let herself gasp with every tap of his flaring tip against the entrance of her womb, eager to feel him finally release within her and fill her womb with his essence for the first time. The first of many, many more times to come.

“Nrgh… Gonna remove… the blindfolds…” Her mystery stallion spoke in a strained voice, letting her know it was time. She felt herself clamp down on his cock even harder at his words.

“Nnnf, hah… T-touch your horn to mine! Make it perfect as you make me yours!” Twilight exclaimed, feeling his nose and horn press against her own shortly after, his thrusts ramming as firmly inside her as he could, his flare growing. The two of them quickly muttered the deactivation phrase for their blindfolds to prepare for the moment.

At long last, Shining’s magic made the blindfolds fly away from their faces, softly smiling as their eyes locked on each other for the first time as they spoke in unison. “I love… You?!”

The whole world seemed to suddenly slow to a near stop as two minds thought the same counterpart thought, their eyes starting to widen in shock.

Shiny?!

Twily?!

Twilight felt herself jump at a dozen ideas at once as her horn charged, simultaneously trying to push him away, wake herself up, teleport to her bedroom, teleport him to the moon, teleport herself to the moon…

Her scrambled attempt only succeeded in making her magic fizzle out with a small burst of magenta sparks, which in turn caused three things to happen in an instant as a result. Her normally swift mind realized her mistake a moment too late.

The effect of such a charge shorting out caused her horn to tingle and her magic incapable of forming a spell for at least the next hour. The direct path to the brain also frazzles the caster’s nervous system and leaves them extremely sensitive to every physical sensation for a full minute for the average unicorn, which Twilight knew worked tenfold for her. And since her horn was touching Shining’s during the fizzle, she had also caused the exact same effect in him at the same time.

Suddenly, she could actually feel her spells start to activate with specific tingles of magic, everything moving in slow motion.

She felt her cervix being tugged into place against the flaring head of his shaft deep inside her, then forced to spread open by a quarter inch in preparation for his coming seed, her entire path inside left clear for him to fill her with ease. Her attempt to pull her hind legs away was thwarted as her hooves were already magically stuck holding onto him, and succeeded only in pulling him even deeper inside, the opening of his tip pressing tighter to the entrance of her womb.

Twilight felt like she was floating, her every sensation overwhelming with the heightened intensity of everything. Her brother’s scent enveloping her, his warm breath entering her lungs as he exhaled, the bed holding her up for him as his weight pressed against her, the heat of his body over her, and so very deep inside her.

All she could do was squeeze her forelegs around his neck and stare into her big brother’s eyes as he began to climax inside of her, his expanded flare spreading her open at her deepest. Due to her slower perception of time in their shared moment, she could even feel the underside of his cock swell as his first burst of cum travelled down his shaft, on it’s way to pour straight into her ready body as that swelling squeezed past the last feeble defense of her desperately clamping folds and sped down her tunnel towards the now spread entrance of her waiting, wanting womb.

Her primed-for-orgasm nerves were on the edge as she felt the burning heat of his cum escape his flare in a powerful jet that seemed to go on forever, searing it’s way through her cervix and surging directly into her womb. An extra tingle just as that first pulse finished flowing into her said her last spell activated to keep every drop of his seed locked deep inside the very place her estrus-stricken body craved it most. Her world seemed to implode as her whole consciousness centered on him spraying that torrent of his essence so deep inside her core.

A rising wail tore out of her throat as her brother’s seed entering her estrus-primed core sent her careening helplessly over the edge. An orgasm she’d never have imagined ripped it’s way through her body, her widening eyes unable to tear themselves away from those of her big brother. She saw the stunned, helpless look in his narrowing eyes, heard his voice exclaim his own orgasm.

Shining couldn’t even react as he felt his climax hit so hard it was on the borderline of pain, feeling himself launch an oversized burst of his virile seed straight into Twilight’s waiting womb. He knew she’d miscast by his frayed nerves, and unable to stop himself as instinct made him push still deeper inside his sister as her hind legs pulled him in tighter, her body tensing in ecstasy. As he cried out, he felt the second pulse of cum rush down the length of his cock and escape, struggling to fathom how it could feel so voluminous as he filled Twilight with every twitch of his spurting shaft.

The two of them came together, eyes locked on each other as their minds were quickly overtaken with every jet he gave her. By the time Twilight felt the fourth burning pulse of Shining’s cum spray past her cervix, her mind was melting. As Shining felt the fifth surge of his seed escape into Twilight, he entirely forgot where he was. By the time the sixth surge of cum transferred from his cock and into her womb, all they could still comprehend was that the pony they loved was there with them, sharing everything with them.

Somewhere along the way, their lips met and they couldn’t stop grinding against each other. Shining pressed against her just as he fired each jet into his mare in an effort to satisfy her estrus, with Twilight feeling almost like a fresh orgasm had started every time her stallion sent more of his burning seed through her cervix to where she needed it most. The only thing they could process, the only thing they could manage to think, was that they writhed together in the pleasure that the pony they loved had given them.

When the euphoria finally began to wind down, it was all they could do to simply let their muscles go slack, unable to move as they struggled to recover from a climax that seared through their bodies. Every twitch and throb of their deeply connected bodies was like an electric shock and a new orgasm on its own. The extreme sensitivity was slowly fading away as they trembled in a staggeringly powerful afterglow that felt more like hanging in a constant euphoric state akin to a normal climax, yet without the tension. Their minds were simply blank as they drifted through what had happened, helplessly carried along until it would reach its end.

Their shared first time had been so powerful, they struggled just to breathe as they weakly clung to each other. Both felt their nerves tingling across their bodies, with the most intensity coming from where they remained joined. Random weak pulses of Shining’s cum were still occasionally feeding into Twilight’s still greedy womb. Each little burst making them flinch and shudder, causing his magic-touched loins to rush the building of another before a tugging clench of her marehood soon triggered him to fire once more and start them over again.

By complete accident, they had experienced something similar to a very advanced unicorn sex technique, and were entirely unprepared to process the experience.