Author's Note

This also includes Cadence having "The Talk" aka The Birds and the Bees aka Sex Ed 101 to Twilight, Vaginal, Impregnation, One well hung dog, Knotting, Oral, Cock n Ball Worship, Watersports(urine drinking/marking territory), and one very wild weekend alone without parents.

And I Guess Twilight Is A Dog Fucker As Well(TBU)

It's a nice warm sunny spring day in Equestria, moreso in Canterlot. It was on this day that the Princess and alicorn of Love, Princess Cadence, just one year after being ascended to alicornhood by Princess Celestia, that she got hired by the parents of one Twilight Sparkle as a foalsitter.

Shining Armor was in royal guard training and Spike was being taken care of by Princess Celesita herself. Her auntie had another student before Twilight Sparkle, but she really doesn't want to talk about that one at all.

Now as being new to her job as a foalsitter, she just has to take care of Twilight while her parents were gone for the weekend.

Her 14th birthday is coming next month as she's only 13 right now and Twilight is only 6 years old.

* * *

It was also on this day today is that her estrus cycle was in full blast. After becoming an alicorn, her estrus cycle was more powerful than of being a pegasus with this cycle. Her auntie had to give her The Talk after she became an alicorn as her Earth Pony parents didn't know what to do during her estrus cycle when she was 6 years old.

"Please take care of our daughter while we're gone during the weekend and also please watch out for Ruffer, our pet dog. He does get rather excited while playing. He's a good dog, but if his thing comes out, then please watch out. He won't stop until he's satisfied. And with two females playing with him, then I say, I'm sorry." Twilight Velvet said, blushing as this happened to her before. She was playing with Ruffer on the day of her estrus cycle was in full swing 2 years after Twilight Sparkle was born. She had to give away her foal after she gave birth to it. She couldn't believe that she gave birthed to a futa unicorn foal. She hoped her 2nd daughter was doing okay with her adopted family. The last time she heard from her futa daughter was that she was happy living with a married couple in Baltimare as their only adopted daughter.

Cadence nodded. "I will Mrs. Velvet. And thanks for the warning. Have fun you two!" She waving her hoof in saying goodbye to the parents of the little light purple filly unicorn. She saw both of the filly's parents leaving and when she no longer saw them, she turned to the filly whose expression turned worried. "Don't worry Twilight, I'll take good care of you during this weekend, as we got the whole weekend alone here to ourselves including that pet dog of yours. Speaking of that dog, where is he?"

Twilight looked at Cadence. "He's in his cage, sleeping." Her face was blushing as there was this burning feeling in her haunches. She doesn't know what this feeling is at all.

Meanwhile Cadence notices the smell coming from Twilight herself, this was the smell of a female pony in their estrus cycle. Cadence herself went through this damn cycle many times and because now there is a male in the house, she can finally satisfy her estrus along with Twilight as this was the filly's first estrus cycle.

She put a hoof on top of the filly's head and pat it.

Twilight felt Cadence's hoof on her head, her body shivered from the touch. "What is this burning feeling in my rump and why do I feel hot?"

Cadence smiled as she answered the flustered filly's questions. "Well Twilight, this burning feeling in your rump is your very first estrus cycle you're experiencing."

"Estrus cycle?"

Cadence nodded. "Yup. A estrus cycle is when a female pony starts feeling ready for a male pony to mate with the female pony to have foals. Right now..." She used her magic to lift Twilight's tail which made the filly squeal in surprise. "...the egg or eggs inside your ovaries get in position so that when the male cums, their sperm travels up the tube with the eggs and impregnates the female." She moved a hoof towards Twilight's winking clit and touched it which made Twilight scream as she came. Fillycum went on Cadence's hoof as the filly continues to squirt out fillycum. After a bit, Twilight finished her very first orgasm.

Cadence then moved her fiilycum stained hoof to her face and lick it. She tasted it and it is does indeed confirm that Twilight is, in fact, on her estrus cycle. She smiled as she finally sees that Ruffer, the pet dog that Twilight and her family has, arrived in the room with them. Her eyes widen as what kind of breed of dog that Twilight Sparkle has.

While Cadence was reading up on the history of Equestria during her first year as an alicorn, she got to the parts about a certain breed of dogs that was almost extinct.

And the dog in the room with them is the only one left of his breed. The last remaining dog breed for lustful dogs. This breed can get a female pony pregnant while they are on their estrus cycle.

Cadence looked at Twilight. "I think he woke up from your screaming and maybe the smell of our estruses. The kind of dog you got as a pet, is the last remaining dog breed for lustful dogs that made female ponies pregnant in the past. I don't think your parents knew about this breed at all. And right now I know that his objective is to impregnate us from our estruses. You can tell that lustful dogs are always very fertile as their sperm count is really high and pregnancy successes are always 100%. Also their cock is that of a knotted cock, like a dog have."

Twilight's mind went blank while listening to her new foalsitter about the kind of dog she got as a pet. The only thing on her mind from all this is to get rid of her estrus. Even though she's a filly, she's having a hard time to just let go and just let her dog put his thing inside her cooter. Her winking clit agreed from this as more liquids were leaking out.

Cadence smirk as she saw that Twilight was trying soo hard to just let go and get that dog to fuck the filly. She then nodded. "You want his penis huh Twilight? Well, let him."

Twilight's tail is still raised up as her ponut was winking.

Cadence looked at their dog as she spanked Twilight's plot with a hoof, which made the filly squeal in surprise. "Go get her."

Twilight's dog, Ruffer, more than went towards Twilight and mounted her. His knot was out of his sheath as his cock was throbbing. He tries to get his cock in the right hole and he felt that the new foalsitter used her magic on his cock and helped him put his cock on the filly's vaginal entrance and push inside. His cock slid inside Twilight's slick and wet pussy.

Cadence's magic was still on Ruffer's cock as he slid more of his cock inside Twilight. She even felt the inside of Twilight's pussy from her magic on Ruffer's cock.

Twilight couldn't even begin to described what she's feeling from her dog being inside her as well as Cadence using her magic on her dog's thing.

Ruffer started to hump fast inside Twilight's pussy. His balls slap on Twilight's small crotchboobs.

"Wow Twilight, look at you go." Cadence said with a smirk on her face. "You might become a pet fucker as a job when you're older. But I don't think auntie Celestia would allow this to happen to her current student." She gotten in front of Twilight and started on bitting on the tip of one of Twilight's ears. "I can imagine from this, you ask auntie Celestia to let you fuck her pet, at first she won't allow it, but you stomp your hoof down to really let you fuck her pet. With all of her years ruling Equestria alone, this will be the first time that one of her students to be this annoying to want to fuck her pet." She moved towards in front of Twilight's face and smirk. "And you won't let her to get your way. So what do you say about this?"

Twilight was panting and moaning as Ruffer was fucking her. She heard what her new foalsitter Cadence said. If she had her way, then yeah, she would fuck her teacher's pet. She saw the smirk on Cadence's face. To give Cadence an answer, she moved her head and gave Cadence a kiss on her lips.

Which didn't surprised the teen alicorn mare at all. She met Shining Armor before but she doesn't love him as a lover, but loved him as a friend.

And now with Ruffer fucking Twilight, she's gonna be next to get fucked by the dog.

Without warning, Ruffer stuck his knot inside Twilight's pussy, locking his cock inside there and Twilight yelped as blood was coming out of her pussy. That was a sign that he broke her virgin hymen. His cock shot cum inside Twilight's unused womb, filling it up.

Cadence felt Ruffer's cock throbbing on her magic as cum was shooting out of his cock and into Twilight's womb.