Blood was pounding in her ears as she raced through Ponyville, ignoring the gasps of Ponyville’s residents as they saw her without her cloak for the first time. She reached the library, knocking on the door before as lightly as possible, trying to control herself.

“Fuedal, Fuedal are you in there?”

She waited for a response, but then her nose picked up something, a smell coming from inside the library, a female’s smell. She started scratching the door, her instincts starting to take over. There was another female inside with her male, and she was not going to stand for it. She busted down the door, taking on a predatory stance as her eyes locked on the female, a hiss escaping her lips before she pounced at the female.

The female vanished, causing her to crash into one of the book cases and scream in rage, the female had escaped! Then she saw her male running out the door and whimpered, wondering why her male was running away, and quickly gave chase.

* * *

Fuedal ran faster then he had ever done in his entire life, adrenaline pumping as he glanced back and saw Death Petal running behind him. He tuned back and kept running, knowing he had to get her back to her hut before she caught up to him, and the last thing he wanted was for his mare to mount him in the middle of Ponyville.

He kept running, running as fast as he could till he finally reached her hut, and then he got tackled by Petal, who grabbed him by the tail and dragged him into the bedroom. She threw him onto the bed, climbing on top of him and purring as she sank herself onto his pulsing member. “I was worried about so worried about you,” said Petal, leaning down and nibbling playfully at his ear.

“So…sorry,” he said shakily.

“So who the hell was the whore you had in your house?”

Fuedal froze, knowing full well where this had come from. Bat ponies were purely monogamous creatures, or they had become so after their exile. Because of this, bat pony females became extremely territorial about their mates, and became practically violent when their heat cycle rolled around, which was why Fuedal had told Twilight to get out of there.

“Hon…that was princess Twilight, she’s just an old friend.”

Death Petal looked confused for a moment, and then her eyes widened in shock, her hooves coming to her mouth as she started remembering what had happened. “Oh my goddess, I almost…”

Fuedal got up and hugged her, ignoring the fact that he was buried balls deep inside her. “Hey it’s ok, you were just following your instincts, I am the one that is sorry, I shouldn’t have left you alone like I did.”

She smiled, nuzzling into the side of his neck. “So…did you figure anything out about why I’m still in heat?”

“Yeah I did, it appears that that potion you have been taking has been making your heat cycle worse, and I had to make a guess I would assume that the reason why it didn’t work this time is that your body had built up an immunity to it, I know that can happen with certain potions.”

“Wow…but, but why the heck did I try and attack her, I mean when I saw her I…”

“Shh, let me explain. Now how far did you get in the book about our mating habits?”
“Not that far, why?”

“You remember that bite you gave me last night?”

She nodded, and he smiled, “bat ponies are monogamous, and when they mate, they bite each other and inject a special kind of venom that marks them as theirs. What that happens the female becomes very protective of her male, and this gets extremely bad when females go into heat, and they become violent, but it wasn’t your fault, you were just trying to protect me.”

She nodded, still a little worried, “and…and how long am I going to be in heat for.”

“Well counting today, we got ten more days of rutting to do.”

She grinned, leaning down and kissing him as her hips lifted up. “Guess we best get started then.”

* * *

“Your sure you saw what you saw Twilight, you sure it wasn’t just some trick your mind was playing on you.”

“Celestia I know what I saw, Death Petal is a alicorn, a bat pony alicorn. This is…I can’t believe…how could you keep this from me?”

“What?”

“You oversaw mine and Cadance’s transformation, you know about every alicorn in existence, so why didn’t you tell me she was one?”

Celestia sighed, shaking her head as she spoke. “My student I want you to trust me when I say I had no idea she was an alicorn, I never met her in the astral realm, therefore she had to have changed by another means.”

Twilight absorbed the news as Luna walked over to her sister, sitting down and giving her a knowing look. “We shall have to leave at once; we must go talk with this mare and discover how she made this transformation.”

“You may want to wait on that,” said Twilight, drawing both the princesses’ attention.

“And why is that my dear student?”

“because it seems she may have been taking a potion to repress her heat cycle, and is now stuck in heat for eleven days, though she is been taken care of at the moment by your student,” she said, pointing at Luna.

Celestia raised an eyebrow as Luna gave Twilight a look. “Really, my personal student is finally sleeping with somepony, I was wondering when he would get around to that.”

“Luna be serious, now Twilight she cant really be in heat for eleven days, you and I both know from books that once they mate their heat goes away.”

“That is true but she ten more cycles of repressed heat built up, so she is going to still be in heat for at least ten more days, were just going to have to wait.”

The others nodded, then Luna got up and headed for the window, “Well I for one and going to do my waiting in Ponyville, I will be staying at dear Fluttershy’s for the time being, I shall see you all latter.”

With that she leaped out the window, leaving the other two princesses behind. “I still don’t get what my sister see’s in her.”

“Oh come on princess, Fluttershy is a beautiful mare; let your sister enjoy herself.”

Celestia nodded, and then leaned down to whisper into Twilight's ear. “So, you want to…?”

“I thought you would never ask,” said Twilight, and then they both walked off to her room, leaving nothing but the guards to sigh in relief at not having to deal with the perverted princess any longer.

Author's Note

Did I mention this would be a four part chapter, I didn't, well it is. Anyway's guys I hope you enjoyed the chapter, and if you have any questions or comments please feel free to drop them on by, you know I love hearing from you.