I had just found a letter in the mail, and invitation from one of my friends. Naturally, I picked it up, carried it out to the kitchen and opened it, before reading. Just that I had no idea that it was from my friend, or that it was an invitation, while picking it up. It isn’t as if any of these things were readable on the envelope, even if the address of the individual sending it was on the opposite corner of my address, as customary.
“Dear Anna Sheridan..
You are here by invited to my home at 17:50.
Come alone, it is hot, so dress accordingly.
Your Pen Pall, Marlene“
The formulation was feeling a bit on the strange side, but I recognised her handwriting and voice behind each and every word.
“I will be there by then. I guess summer is considered hot. Pen Pall, I do know you enjoy writing, but now you are being silly, are you not? Either way, I will be there by the appointed time, rest assured!” I thought.
Of course I knew she enjoyed my company, but Dear was a bit over the top, wasn’t it?
Either way, I had chosen to accept the invitation and promptly knocked on her door, at the specified time. Just about as punctual as she was to expect from me, in any case.
As I finally did reach her door, I wear nothing but a skirt and top, not even any panties. Just a pair of boots, though. For convenience, I am carrying everything I had with me in a minimal backpack.
“Come in!” she offered as she opened the door.
“Hiya!” I responded as I followed her into the hall, as she closed the door behind me.
“You came. I see you did come hot as I could have been expected, the red suit fits you just right!” she then responded, leading me towards her kitchen.
“It certainly is warm enough to feel just a little bit hot. Besides, I like this suit, knowing you would approve did not exactly hurt!” I responded as I followed her into her kitchen.
Two cups already standing on the table, awaiting us. One on each side, before the respective chair. A small pot of hot water on the table. I could see the selection of teas on the table as well. She had already prepared for my arrival, but what to expect? She knew when I was expected to arrive.
“A small gift for you, Marlene!” she proclaimed as she pointed at a small beige cardboard box by the cup, where I was sitting.
“Thank you, Anna!” I responded as I picked up her welcome gift, then promptly opening it, only to find the tube intended for my rear end, the back door.
Apparently I had not noticed the changes to her form, body or pose, which is why I had addressed her as her regular name. The name I had known her by, for ages. Just as I had not realised what the clear rubber tube was intended for, or what it was to do to me, once inserted.
“I take it you are bare bottomed under your skirt!” she put forth, looking at me eagerly.
“Of course. Wasn’t that implied in your wording, in the invitation?!” I responded.
“Yes, that was the intent. If you pick up the tube?” she responded with a sly smile playing on her lips as she was about to guide me on the intended exploit.
“Like this? I inquired as I attempted to follow the instructions, slipping a finger into the tube, but finding it strangely slippery and unexpected elasticity teasing my senses.
“Yes. Now, if you lift up the front of your skirt with your free hand before slipping your hand in and insert the tube from behind!” she instructed me.
“Oh!” I responded as I followed her instructions, feeling the tube enter eagerly, while stubbornly staying where it went in as I pulled my hand out from under the skirt.
“By the way, call me Pen Pall, or Pen for short!” she suggested, pointing at the mark on her right flank with the free hand.
“Pen? Why? Am I as hot as you had hoped? What is the idea with that clear rubber tube? That is what it is, right?” I responded, not sure of anything, right now.
“Yes, that is me, thank you. I hope you will enjoy what I had in mind, what is about to happen in a moment. You see, I chose this individual tube with you in mind. You are going to be as hot as I could ever hope for. Now I just have to wait and see what your mark and name is!” she pointed out, with a mix of certainty and raving unsure giggles.
“I can’t even feel the tube anymore. It is as if it had never been there. Mark?” I responded.
“I thought as much. You see, I can’t feel mine either. You are not supposed to feel it more than the first instant after insertion, which you may have noticed; you were incapable of preventing, if you had tried!” Pen enlightened me.
“You can’t even feel it, if you focus on it? I guess that is hot, if anything!” I responded.
As I lift my right hand up to my face, palm up, I notice it had already turned a brilliant silicone white, and just as smooth, making up what was to pass for a suction cup, while the tips of my fingers had become miniature hooves, matching Pens, only mine are clearly a bright, iridescent pink.
“There goes my carefully done manicure!” I observed.
“And your do, mind you?” Pen teased as she saw the split bangs in the Unicorn style.
Of course my mane is the same colour as my hooves. The res of the hair is hanging back in two lines of three thick braids, reaching all the way down to my now extensively plump rump, which incidentally makes it comfortable to sit in the chair. Just like Pen, I have a tail, mine in a matching pink hue, curling in curious, stylish manners, befitting my persona.
“I like your mane, it fits you, and it is extremely hot, if you don’t mind me saying so?” she then complimented.
“I guess it is me, in the manner of what the tube had been intended to interpret my personality and preferences? I may look like you, but all the aspects make us individually unique as Ponies, in the anthropomorphic form. You did choose it, right?” I responded.
“Speaking of unique, I think you have a very special mark, an eight-sided stare with little Horse shoes in the rainbow spectrum at each ray of the star. Only with a pair of quills crossed behind!” she observed.
“That is so pretty, what ever it is supposed to signify!” I giggled.
“Yeah, that is actually quite pretty, now as you put it like that. On the other hoof, I think the manual stated that the tube, or backdoor would be integrated into you, for as long as you are the Equine form of the Back Door. You will only find it, when you intend to pull it out in order to reverse the effect. Only you can even find it, not even I can find yours, no matter how closely I was to examine you, or for how long I was trying!” she enlightened me, matter of fact.
“Wait.. Pen!” I exclaimed, realising that I couldn’t remember her Civil or Human name; she is simply Pen Pal to me.
“The quill isn’t the same as a pen, there is a significance to the differences in our marks!” I then concluded.
“Yes,
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