Futanitiation

Twilight slowly opened her eyes to a newly familiar sight. She was still lying on Princess Celestia's chest, the white alicorn's forelegs still wrapped around her. Twilight looked around, seeing that Celestia, along with Luna and Cadance, were still fast asleep. The room they were in was still decently lit, albeit not as bright as it was during their earlier activities.

Speaking of those activities, Twilight's brain was still trying to comprehend the monumental sense of pleasure that her new stallionhood had provided, combined with the feelings of having all her holes penetrated. It was nothing like she had ever felt before. Being filled to the brim, growing a new appendage, and then putting it to good use all in one night. It would be one experience she wouldn't have to write any letters about.

Not knowing what time it was, Twilight yawned audibly as she lay the side of her head back down on her former mentor. However, the movement and sound caused Celestia to stir slightly, and then she opened her eyes. Twilight was a bit taken aback as she looked the sun princess in the eyes, but she loved it, considering how she was able to express her utmost appreciation and affection for her through their earlier union. "Hi..." Twilight whispered to Celestia.

"Hello, Twilight," the white alicorn whispered in response, rubbing her former student's back comfortingly, "How are you feeling right now?"

"Just...absolutely wonderful. I mean, it would have been nice if I had known about this in advance, but I don't care at this point. I've never felt this amazing in my life. Thank you."

Celestia gave the purple alicorn a warm, loving smile. "You're welcome," she replied.

"No, not just for this, but for everything. I know I may have already thanked you at my coronation, but now that we're face to face and secluded from everypony else - well, except those two," Twilight said while gesturing to the to sleeping alicorns on the mattress who were still in a spooning position, "Now I can really express my gratitude. So...thank you, Princess Celestia. Thank you for being my teacher, my mentor, my leader, my key to success here in Equestria, everything. Thank you."

Celestia leaned forward and kissed Twilight on her forehead. "You're welcome, Princess Twilight," she replied in her most soothing tone. After that, Twilight began to lay her head back down, but Celestia quickly stopped her. "Twilight," she continued.

"Huh?" Twilight replied.

"Before you go back to sleep, I was wondering..."

"What?"

"Well, remember when you almost accidentally penetrated me in the other hole down there?"

Twilight's eyes widened upon hearing Celestia bring that up. She continued in a whisper, "Oh, yeah. I'm really sorry I did that. I hope I didn't anger you or make you feel uncomfortable."

"Don't be sorry, my dear. I did, after all, say we would get to that later. And now, since we're both awake, I suppose we could...if you're up for it..." Celestia finished, giving Twilight a devilish grin.

Twilight immediately knew what the elder alicorn was getting at. Though it had never even crossed her mind to for anypony to have sex in anywhere but a mare's vagina, her curiosity was getting the better of her, just like it had done many times before. However, there was one other factor they had to consider. "In front of them?" she asked in a whisper, pointing to the two sleeping alicorns for a second time.

Celestia nodded. "Trust me, I don't think we'll make that much noise," she replied.

"I sure hope not..." Twilight thought to herself.

At that moment, the young alicorn felt one of her former teacher's hooves leave her back and head for her hind quarters. She had a feeling that she was going to give her rump some affection, but instead, it went past her rear, and she couldn't exactly feel where it was going. Eventually, she heard a small gasp coming from Celestia, and she turned her head around to see what was happening. Her eyes widened again as she realized that Celestia had started to rub her own pussy, and she soon heard a slight squelching noise as it became clear that Celestia had become wet. Was it because of the prospect of Twilight giving her anal? The purple mare would never know.

All of a sudden, Twilight felt herself being surrounded by Celestia's magic as she was lifted up and positioned at her personal area. She took one look at the white alicorn's soaked marehood, and it was enough to make her new cock come out of its sheath and slowly harden. Once it was fully erect, Celestia used her magic to guide her former student's member into her waiting pussy, and then the two of them were connected once again. Twilight was unsure why Celestia was doing this, but it didn't matter in the slightest, considering that her cock was inside her former mentor once again, throbbing as it sent massive waves of pleasure throughout her body as she moaned.

Celestia then pulled Twilight out of her and placed her back on the ground, standing her former prodigy on all fours as she rolled herself over onto her stomach. She got into a position that was identical to Luna's earlier one, when Twilight had taken her from behind. Once she lifted her tail and exposed her most forbidden area, Twilight knew exactly why she had had her plunge her member into her pussy. She was going to be the one taking Celestia in the ass, not the other way around.

For some reason, Twilight didn't find herself the slightest bit nervous as she reared up on Celestia. She took one more look at her target, seeing that it was fairly puckered and didn't seem to be capable of taking much. That theory, however, would soon be put to shame. With her former teacher's fluids coating her erection, Twilight mounted Celestia and used her magic to bring her cock into position. She poked her pink head at Celestia's back door, making the white alicorn gasp and shiver at the sensation.

Twilight then pushed forward, the tip of her stallionhood slowly penetrating Celestia's anus until it popped inside. "Ah!..." both alicorns gasped, silently. Never before had either of them felt a sensation like this. Celestia had never had the time in the past to experiment with her rear entrance, and it was something she desperately wanted to try out, and now, Twilight was fulfilling that desire.

Twilight gently eased herself further into Celestia's plothole, stopping periodically to allow the white mare to adjust to the intruder in her behind. "Mmmm..." Celestia moaned into one of her forehooves as she bit down on it. Twilight herself was also moaning quite audibly, but she was keeping her mouth closed the entire time. Inch by agonizing inch, Twilight pushed her cock further into Celestia's rear until finally, her balls made contact with the white alicorn's outer lips.

Feeling her former student's member completely inside her ass, Celestia gave another muffled moan as Twilight herself groaned into the fur on Celestia's back at the sensation. This was nothing compared to having normal intercourse with her former teacher. Celestia's anus was so tight that she worried she may not be able to pull herself out. Nevertheless, that was the last thing on her mind as more pleasure racked her body as Celestia clenched around her penis a few times. As for Celestia herself, her own stallionhood was now fully erect, sandwiched between her belly and the edge of the mattress. It was a rather uneven sensation, but having it rub against anything at this point was all she wanted as her former student began to back up.

Twilight slowly pulled back, Celestia's puckered hole denying it exit a few times before only the head remained inside, and then she eased herself back in, albeit faster this time. After repeating this process a few times, Twilight built up a rhythm to where she was pulling in and out at the rate of one thrust per second. With each pump, Twilight's reasonably sized scrotum slapped against Celestia's vaginal lips, giving the elder alicorn even more pleasure than she had anticipated. "Ahhh...Twilight..." Celestia said in-between thrusts as she turned her head and brought a forehoof to Twilight's right cheek, "Don't...stop...Ahhh...You're...doing...great...Ahhh!"

"You...Ahhh...feel...Ahhh...amazing!" Twilight replied, panting as she continued giving the almighty ruler of Equestria anal.

She then noticed that Celestia was flexing her already-erect wings in the same way she did earlier, most likely heading for her own wings and horn. She then stopped thrusting, causing Celestia to look back at her again with a puzzled look, her wings freezing in place. "Let me handle this," Twilight whispered, her voice laden with love and lust as she looked Celestia in the eyes.

Celestia nodded and turned her head away again, and with that, Twilight resumed her thrusting. The white alicorn then gasped again as she felt a new sensation in her loins. She looked back once more to see Twilight's horn illuminated, and she realized that her former student was using her magic to fondle her clitoris, which made the pressure inside her quickly rise.

"Twilight...Ahhh!" Celestia exclaimed, louder this time, "I'm going to...I'm going to...!"

"So am I...Ooohhh!" Twilight moaned as she felt her stallionhood begin to pulse violently. Her magic had started to falter upon having the pressure rise, but at this point, whatever pleasure she could give was enough for Celestia. Neither mare cared that their cries of pleasure were louder than they had wanted. They were too far lost in the land of untold euphoria.

Within the next several seconds, both alicorns reached the summit, and their orgasms crashed over them like a tidal wave. Twilight's magical ministrations on her love button caused Celestia to clench her former prodigy's member tightly as cum flooded out of her empty marehood, staining the edge of the mattress and the floor below. At the same time, the increased pressure caused Twilight's cock to fire multiple jets of cum into Celestia's plothole in rapid succession. The white alicorn moaned in primal bliss as her deepest, most forbidden regions were flooded with warm, creamy love juice, and Twilight did the same as her pulsating cock remained trapped inside Celestia, whose own stallionhood fired multiple strands of cum onto her white-furred chest and the mattress.

Finally, both mares slumped down, Celestia's muscles relaxing and allowing Twilight to slowly pull out of her. She met some resistance along the way, but she was soon free of the white mare's backside and lazily fell to her side, her upper body laying on the mattress as she panted heavily.

Amidst the sexual haze, Celestia noticed Twilight's current position and used her magic to pull her fully onto the mattress. She then pulled herself onto it as well, and then she wrapped a wing around the purple alicorn as she laid her head down and basked in the sensual afterglow. Continuing to pant, the Princess of the Sun said, "hhhh...Thank you, Twilight..." She got no response, so she looked down, only to notice that the immense pleasure had already sent Twilight back to sleep, her member tucked away in its sheath once again. Celestia smiled, leaned down, and kissed Twilight on the forehead before laying her own head back down and closing her eyes, joining her former student in sleep once again.

"They seemed to have quite the time..." Cadance whispered to Luna, both hers and the other alicorn's eyes open ever so slightly as they glanced over at Twilight and Celestia.

"That they did, Cadance," Luna whispered back, her forehooves still wrapped around the pink alicorn as they continued spooning, "That they did..."

THE END (for sure...)