After the events of yesterday finished, your chest shrank back to normal, the "milk" that was pumped out was essentially poison joke extract, so Twilight had it re-purposed into more of the conditioner so that the issue wouldn't happen again. Your hair did feel softer and fuller, though. So she wasn't lying about that. You two both woke up in the same bed this morning, and your day went on as usual. Breakfast and lunch were great, work was also as good as work can be, nothing good or bad stuck out. But throughout the day, you tried to guess what your "special surprise" would be. You tried to goad her into divulging her secret plans, but she was not budging. So she just left you wondering.

The day ended, other workers packed up and gone home, and you meandered into the study where they had the good armchairs, as you so often did after long days at work. You sat down and just kind of slumped down when something caught your eye. It was a red flower petal, you assumed it was from a rose. A rose petal? you thought, A bit cliche, isn't it? Well, better follow them and see where they lead.

You followed the trail of petals, obviously leading into the bedroom. You slowly open the door, wondering if you're early for the "surprise", or if Twilight would even be there at all. Well, she was. She was lounging on the bed, sporting a skimpy pink robe, loosely tied but still covering up most of her body from the thigh up. You followed the trail of petals on the floor, to the bed, and it ended right at the beginning of her bath robe, right at her groin.

"You wondered what your 'special surprise' was?" she asked in a sultry tone, "Well, here it is."

She slid off the robe, and where you expected her large package, all you saw was a small triangle patch of navy public fluff pointed down at her lower lips. "Tonight, this is yours." she says. "Go get that bottle of lube from the drawer and come get me ready." You run to the dresser and open the top drawer, which is where you keep the lubricant. You were glad it was going on your dick tonight. You quickly undress, not caring where your clothes went. You walked towards the bed after undressing, and got onto the bed and started to kiss her, holding her head to make sure you stayed close, and slipped your other hand down low. She wasn't really wet just yet, so you had to prep her up. You slid a finger in her, massaging the walls of her vagina and helping her lubricate just a bit. She moaned quietly into your mouth during the kiss (and really cutely, you thought), as she started to feel a bit wetter.

She breaks the kiss, grabs the bottle of lubricant from on top of the bed, and squirts some into her palm. She grabs your dick and balls and starts to give you a handjob to get you ready, using both hands; one on your member and the other on your ballsack. The lubricant was clear and unscented, but you felt a tingle as she continued to work it around, and you knew that meant something, something potentially bad. "Is it working yet?" she asks, fully aware that the strange faces your making obviously display that.

"Oh yeah." you quietly in a worried tone, "What's it supposed to do?"

"Just wait for it..."

Not a couple second after she finished talking, you felt it. You saw it in the head of your dick. It started to expand and flatten out, as if it were starting to look like...a horses'. The tingling continued, making it grow every second. You felt it get denser until it felt like it weighed two pounds in your hand, growing almost as big as hers was, growing to over a foot in length and what you thought would be 7 inches around. You never had any real envy for her size, she was a magic royal horse, so most things were possible, and so you wouldn't blame her for wanting you to be a bit bigger every once in a while. It finished its growth and recolored to lighter shade of your slightly-tanned skin, close to pink, as you felt the skin around your dick get a bit heavier, keeping its original color. Your balls were still tingling, so you know they were next. They started to fill up and expand, like water balloons filling up with heavy cream. They went from their normal chicken egg size, and expanded to be as big as avocados. Your sack started to droop as the pouches contents got bigger and heavier. For the final touch, a medial ring formed just above where your new sheath ended, and a couple veins snaked their way up your new equine member.

All while this was happening, Twilight had taken some of that lube and was fingering herself with it to make her even slipperier and make entrance even better.

"Get up here. It's time for this pony to ride instead of be ridden. I want to feel all of you inside of me."

You slide up on to the bed, and you prop a couple pillows up by the headboard so you don't hurt your self. Twilight slides around you, and stands up on the bed over you. This may be the first time you've been towered over by her without a dick in your face. She slowly crouches down, touching the tip of your new flat cock to the very edge of her pussy. You both let out a small moan. Neither of you have really felt pleasure like this anymore, thanks to the new larger surface area of your dick. She slowly descends down the pillar of turgid flesh, moaning and exhaling the whole way down. She stops when she gets down to her knees, which put her just past your medial ring, not quite bottoming out. She puts her hands on your thighs to be able to lower herself, and you put your hands on her hips, so you can lower her down.

"Ready?" you ask, noticing she's adjusted to your size by now.

"As I'll ever be."

She lowers herself all the way down, thanks to a little help from you. You can see a faint bulge above her pubic area, stretching the area under her belly button. You guess you are that big now.

"Ooh, we have to try this more often. I've never felt so full!" she gasps.

You start to feel it, too. Her inner walls are amazingly warm and tight, you can almost feel her insides stretching to accommodate you. She pushes off of your legs, going back up to try and take in as much as possible on the way down. She drops back down, you thrust up as it happens, and she lets out a cute little squeak as you push more of you inside of her. She goes back up to feel that sensation again, and the cycle begins. For what seems like 10 minutes, you both are like a well-oiled (lubed?) machine, like dance partners who are amazingly in sync. As she pushes up, you bring your hips down, just to slam them back up into her as she comes down. Your balls slap against her backside, bouncing up and down with every thrust, almost as if they were sloshing full of seed. The synchronized sex continues, when she starts to eek out some words in time with the thrusts.

"I'm.....going.....to.....cum!"

You feel her vaginal walls contract, as a clear liquid sprays out of her spread-open slit. You suddenly felt yourself flare up inside of her, almost locking yourself inside of her for the time being. Her release was apparently all it took to put you over the edge, as you give a grunt before you release. It's an orgasm like you've never felt before. It comes out like a cannon, feeling like it is a solid line of cum, shooting up into her vagina, and almost feels like it went past her cervix. You hold her down on your spasming dick, as more of your hot seed shoots up into her. She has a second orgasm, just like that, her fluids now mixing with yours at the base of your dick. It was a solid 30 seconds of orgasm, and you even saw her stomach distend some. It felt nice to be on the other end of it for a change.

She is as spent as you are, and falls on to your chest, and slides your dick out of her, growing softer by the second. What you think is about a quarter of a cup of jizz leaks out of her, your cock being the metaphorical plug to her drain. Both of you are breathing heavily, chests going up and down on each other, panting for breath. A minute later, she finally puts her mouth next to your ear.

"That was amazing. And I forgot to mention, there's a part two to the surprise." she whispers into your ear,

You feel your dick suddenly tingle a bit as she backs off and kneels in front of you, as your manhood looks like it's covered in glitter? You see the same thing happen right where her pubic hair was. It feels like it's...getting smaller. Mus be going back to normal. But what you see starts to worry you. It starts getting even smaller than you remember it. You feel something...open up inside of you, like your skin was being ripped open under your ballsack. A huge pain starts to come from that area, and you reflexively reach for your balls. But they're also getting smaller, or just further away. You look down in horror to see that there is now an opening in your groin, and your balls are going into it! You reach for them to try and hold on, for some reason, and that takes the attention away from your dick, which is still getting even smaller and thinner. Your balls feel like they just moved up into your body and kind of dissolved, while your dick starts to also move near the top of that opening. You know what's happening now, as the edges of the opening are getting redder, and more...petal-shaped. Your dick gets smaller and smaller to where it's just a couple of millimeters long, resting at the top of your newly formed...vagina.

"What the fuck is this?"

"The surprise, silly. You didn't think you'd get to have all the fun, did you?" she replies back, in a bubbly tone. You also noticed that while you were dealing with your genital change, hers did, too. Or rather, her dick and balls were back. Same as ever. And there was a little bead of pre, all ready to go. "And now, we're going to have a lot of fun, just my way this time." Her horn glows and she snaps her fingers, and what look like handcuffs made out of magic suddenly fasten your wrists above your head, attaching them to the bedposts and leaving you at the mercy of your marefriend, your new equipment getting aroused.

She lays down on her stomach, her face inches away from your opening. She starts to lick. She licks at the folds from bottom to top, finishing with a small tongue flick of your clitoris. You gasp loudly, almost a scream, as you feel an intense wave of pleasure surge through you. She continues the tongue attention, even slightly pushing it in, which elicits a real scream out of you. It's a good thing this bedroom was soundproofed. She then moves up to the top of your vagina and starts to suck on your clitoris a little bit. It's all clearly too much for you, and you yell and let loose your first female orgasm, legs raising up into the air as a clear, sticky fluid jets out of your vagina and all on to her muzzle and chin. She closes her eyes due to the discharge and the sound of your screaming, and then gets up back on to her knees.

"Tasty." she licks her lips, savoring the taste. "Now that you're all set to go, why don't you get me ready."

She thrusts her dick in your face, clearly taking charge for reals this time. You quickly nod, scared and horny for what's to come. You open up your mouth, and she wastes no time in sticking it in, thrusting in and out quickly to get a quick spit shine before penetration. She's being rough with your mouth, hopefully she takes it a lot easier on you when it comes to the real thing. She stops working your mouth, and removes her dick, as you gasp for air. She backs away, her tip mere inches away from taking your virginity. "I promise I'll be gentle to start."

"Just to start?"

"Well, we'll see how it goes. Ready?"

"As I'll ever be."

She pushes the tip in, and you shudder, not being able to comprehend what's happening. It was like nothing you've ever felt before. It was different than anal, it was like you were reacting back to what she was doing. She grabs her dick and rotates it around in your opening, making sure to hit some spots right away.

"Doing okay? Can I keep going?" she asks, looking at the faces you're making.

"Mmhmm." you manage to say through pursed lips, nodding.

She starts to push forward, stretching you open like nothing you've ever felt before. You're watching it go in, and it's one of the oddest, most pleasurable things you've experienced, new sensations popping up with every millisecond of movement. She continues to slide in, moving every so slowly to make sure you aren't being hurt. But then she stops. You almost feel like her tip has hit a wall. That must be the hymen.

"I'm at the medial ring, and I'm going to push in just a bit harder. Will that be okay?"

All you manage to eek out is the same "mmhmm". You want to close your eyes so you don't see it go in, like getting a shot, but you really want to see it go in. You feel her push a bit harder, as you yelp a bit as you feel your pussy lips expanding to accommodate the larger girth of her mare meat. You start to look down, and feel a trickle of warm liquid flow down. A few drops of the red liquid start to appear on her dick.

"Is that...blood?" you worriedly ask.

"Yes, just a little. That can happen when you break the hymen. It will be fine." She looks you in the eyes as she says the next sentence, "Trust me. I would never hurt you like that."

You nod, that actually made you feel better. She continues to slide up, you can feel every vein and texture on her cock, and it's still the most glorious thing you've experienced in a long, long time. You suddenly feel her stop after a bit more pushing.

"I'm all the way in. How do you feel?"

You notice that she's run out of dick to push into you, her balls right up against your butt. You look down to your stomach and see a lump in your stomach that runs past your belly button. You wonder how this is anatomically possible, but realize you're dating a magic horse woman with a penis. She undoes one of the "handcuffs", to your surprise. You reach down and start to feel the bulge, it's very hard, but also soft and comfortable at the same time.

"I've never felt more full in my entire life. It's really warm and big. I feel so stretched, but so tight."

"That's good, just letting you take a little break before we start."

"You mean?"

"Yup. Get ready to get fucked."

You almost came then and there. She quickly snapped her fingers, and your hand shot back into place, leaving you helpless. And as she stated, she started to pull back , just to the medial ring. "Here we go," she says, hoping you're ready. You thought you were, but clearly weren't as she pushed into you at a harder pace. She hits your insides and you instantly cum. The dick has given you so much pleasure in such little movement, it takes your breath away. You feel a slight leak of her pre-cum in your new...womb, you guess?

"Whoa now, don't go making me bust just yet, we've got a bit more work to do."

You come back down from the short high and she resumes. Her hips pump tenderly, but firmly. She starts slow, but as she goes on, she starts to pick up the pace. She moves up higher on the bed, her chest suddenly level with yours, her head close to yours, but looking down at her entrances and exits from your womanhood. Her thrusting now starts to get more powerful, going harder and stopping as her balls begin to slap your butt, causing your ass cheeks, as well as the rest of you, to ripple and bounce with her movements. Every hip movement is graced with your cries, the "ah! ah! ah!" like a metronome of pleasure. She continues to speed up, as you both get closer to your final orgasm.

"Brace yourself, It's about to come!" she says through bared teeth, thrusting.

She speeds up, two thrusts a second becoming the norm. For some reason, you take your legs and wrap them around her back, pulling her towards you and locking her into place as you feel a new sensation of her flare locking you in place.

"Ahhhh!" you both scream in unison, your orgasm sending waves of pleasure through your body, clamping down on her horsecock, as your legs pull her even closer to your body. She thrusts one last time and stays in that position, hands planted on the bed, as her cock begins to let go. This was a new kind of warmth for your body, one that felt less heavy and more...welcoming. You feel an area near your belly button start to swell, but it's a different feeling from a normal inflation. Her ropes of cum shoot into your body at incredible speeds, feeling even warmer since her dick was firmly lodged into place. She thrusts a few more times as more comes out, as if she's trying to fling her seed into your body.

Her magic finally gives way as she appears to be spent, and your hands drop to the bed. Twilight drops on to your body as you both lay back on the soft mattress, her head on your chest, rising and falling with your heartbeat. You feel her dick getting softer in you, and it slowly begins to slide out as she rolls over, landing next to you on the bed, head still on your chest. A solid cup of sperm leaks out of you, though there's still quite a bit left in you. You put one arm on the bump in your gut, and put the other around your exhausted lover.

"Wow." you break the silence, still gasping for air.

"Yeah, wow." she replies, unusually simple.

"That was a special surprise, you weren't lying." you chuckle, patting your cum gut.

She chuckles back, "You bet it was. How did it feel to be on the other side?"

"It was...interesting. Am I going to get pregnant?" you ask worriedly.

"Nah, you didn't get any ovaries. I could have done that, but decided not to. Baby steps, you know. So, what did you think?"

"I think I want my dick back."

She chuckles. "It'll come back in the morning. Let's just go to sleep. Good night."

"Good night to you, too." You both move in for a kiss, and basically fall asleep right there, on the bed still soaked in cum and sweat. Neither of you minded, it'd be cleaned and ready for another exciting day tomorrow.

Author's Note

Thanks for reading these chapters so far. I hope to get all 7 days done, but finals are coming up and I might not do much next week. We'll see what happens. Any criticism is much appreciated, and I hope you've enjoyed what you've read.