Twilight Velvet could remember having some pretty crumby Hearth's Warmings in the past. There was the time when the heater broke. But they all slept in the living room by the fireplace, as a literal hearth warming. There was the time the tree got knocked over and many of the ornaments broke. But they got new ones over the years. Whenever things went awry, the family always found a silver lining, and a way to make the best of it. Velvet was having a hard time finding the silver lining to being in court on Hearth's Warming Day. The defendant in a case of preposterous charges.

"All rise!" the bailiff called out. Twilight Velvet and everypony else in attendance stood as the judge entered. "Her Honor, Princess Celestia presiding!"

Princess Celestia walked in, eschewing her crown and royal accoutrements for the simple robe of a judge. She took her seat and gave the gavel a polite tap. "Please be seated. This emergency trial court is now in session. I would ask that we keep these proceedings brief; I know we all have holiday celebrations to get home to. This court will now hear the case of Sparkle vs Velvet. Mrs. Twilight Velvet, you stand accused of criminal infidelity and the use of dark magic. How do you plea?"

Velvet pantomimed aggressively in her seat, pulling at her hoof cuffs, chained to the defendant desk. Though no words came. A spell had temporarily muted her. Her representing attorney, Diamond Gavel, stepped forward. "My client has pleaded not guilty, Your Honor."

"Bologna!" Twilight Sparkle barked.

Celestia glared at her. "The prosecution will have their chance, Miss Sparkle. Another outburst from you in my courtroom will find you with a muting spell as well!"

"Sorry, Princess."

Celestia gave her robe a tug. "In here, it's 'Your Honor'. Don't make me remind you again." Twilight nodded sheepishly. Celestia put on a small pair of reading glasses and picked up the folder on her pulpit. "The prosecution will present their case against the defendant, along with any evidence and witnesses. The defendant will be offered the rebuttal opportunity to refute these accusations levied against them. After which the jury will deliberate and reach their verdict." Celestia nodded to Twilight. "The prosecution has the floor."

"Thank you, Prin- er, Your Honor!" Twilight stammered as she got up from her seat to address the jury. "Ladies and gentlecolts of the jury, today the prosecution will prove, beyond a reasonable doubt, and with overwhelming evidence, that the defendant, Mrs. Twilight Velvet, is guilty of infidelity. And I know that you will all come to the same conclusion with your verdict as a jury that is just so smart and good-looking as-"

"Miss Sparkle..?" Celestia interrupted, expediently pointing at her wrist. "Hurry it along?"

Twilight Sparkle cleared her throat. "I call my first witness to the stand... myself!" She got up into the witness stand. "I swear to tell the truth, the whole truth and nothing but the truth! Now let me tell you what went down... I stayed up late last night to try to catch Santa Claus. I set up a camera and everything! And that was when I saw Mommy kissing Santa Claus, underneath the mistletoe last night!"

Twilight Velvet rattled her shackles.

"Object all you want, but I saw you!" Twilight Sparkle said. "And then I saw Mommy do much more than just kiss Santa! I call your attention to Exhibit A!"

A projector screen came down from the ceiling and Twilight Sparkle put a VHS cassette tape in the projector. The tape started to play, and the screen lit up with the dimly-lit living room of Twilight Velvet's home. The camera itself looked to be concealed inside a piece of furniture, aimed in the general direction of the fireplace.

Twilight Velvet entered frame left, and a white-bearded, stallion, dressed all in red, entered from frame right.

"Happy Hearth's Warming, Santa," Twilight Velvet said to the stallion. "I've been a very naughty filly."

"By her own admission!" Twilight Sparkle shouted as she paused the video. "She admits her guilt!"

The video resumed. "Nice fillies get rewarded," Santa said. "Naughty fillies are the reward!" They kissed, with an obscene amount of tongue. "Santa has a candy cane for you to lick!"

"Oh, Santa!" Velvet purred as Santa sat in the armchair and she started sucking his 'candy cane'.

Sparkle paused the video again, zooming in on Velvet's bulged cheeks. "That's the mouth that kisses her foals to sleep!"

"Yeah, suck Santa's jingle bells!" Santa said in the video. Velvet licked and sucked his balls before going back to deepthroating his dick. "Fuck! You better bend over or else Santa's gonna be coming down your chimney!" Twilight Velvet bent over and Santa mounted her. "Oh, yeah! Your street isn't the only thing getting plowed tonight!"

The camera zoomed in on Velvet's vulva, at the moment and point of penetration. The entirety of Santa's shaft slipped inside her in one smooth motion.

"See how easily he slides in?" Twilight said. "Clearly Santa's diminutive penis is nothing compared to the monstrous length and girth of my father's cock! But there can be no more clear of evidence of infidelity! Santa, balls-deep in my whore mother! And there..!" After a few minutes of rutting, Santa's shaft started to visible pulse and throb, pumping as he emptied his balls into the mare. "I rest my case! My mother, Twilight Velvet is guilty of infidelity, taking Santa's hot load deep inside her marehood! Therefore, I motion that custody of my father's cock should go exclusively to me!"

"I beg your pardon?" Judge Celestia asked.

Twilight Sparkle repeated herself, "I motion that full custodianship of my father's cock should go exclusively to me, a mare that will properly appreciate him and faithfully tend to his stallion needs at least daily!"

Judge Celestia blinked. "Well, then... if the prosecution rests..?"

Twilight Sparkle nodded.

Judge Celestia looked at Twilight Velvet's defense attorney, Diamond Gavel. "The defense's rebuttal?"

Diamond Gavel stood up and pointed at the stallion on the projector screen. "Your Honor, that is clearly not Santa. That is very obviously my client's husband, Night Light, wearing a Santa costume. You can plainly see the straps for the fake beard, and if you rewind to the, eh... Fellatio segment, his cutie mark is plainly visible. Thusly, the defense calls to the witness stand Mr. Night Light."

The dark-blue stallion shuffled up to the witness stand.

"Do you swear to tell the truth, the whole truth and nothing but the truth?"

Night Light motioned to his mouth vigorously.

Judge Celestia looked at Twilight Sparkle. "Madam Prosecutor? The muting spell?"

Twilight removed the spell.

Night Light screamed. "Twilight! Stop this at once! That's obviously me, not Santa!"

Twilight put the spell back in place on him. "I motion for my daddy's testimony to be dismissed on the grounds that he is under my evil mother's mind control magic, making him say these things! Thus I charge her with secondary counts of dark magic against her."

"Do you have any evidence to support this claim?" Judge Celestia asked.

"Magical disguises!" Sparkle said. "Fake cutie marks! There is precedence for both! Santa could have been replaced by a changeling for all we know! But there's one thing you can't fake!" Twilight's magic glowed around Night Light's sheath, coaxing out his penis. "I can prove that isn't my father in the video! My father's penis is much bigger!"

Night Light's erection grew to full mast. As a stallion, he was exactly average, just like in the video.

Twilight's magic started stroking him. "I- I'm sure it gets bigger..." She kept stroking her father's penis in the middle of the courtroom with no further growth visible. "But surely he lasts much longer than-" Night Light quickly ejaculated in just a couple moments, staining Twilight's blue lawyer suit with several sticky, off-white streaks.

"..."

"But Santa slid inside her so easily..."

Judge Celestia removed the muting spells. Velvet jumped to her hooves. "Twilight, I've had two foals! And for fuck's sake! THERE IS NO SUCH THING AS SANTA!"

"There... there's no Santa?" Twilight asked Celestia with misty eyes.

Celestia nodded.

Twilight whimpered, "But... but Daddy, I wanted exclusive rights to your cock!" She dispelled his muting hex.

"I'm sorry you had to find out this way," Night Light said. "But you are almost thirty."

"So unless the prosecution has anything else..?" Judge Celestia asked. Twilight Sparkle pouted and shook her head. "Then I hereby declare this case dismissed!" Celestia struck the gavel. Everypony filed out of the courtroom to go home to what remained of their holiday.

Once everypony was gone, Princess Celestia shrugged off her judge robes and rewound tape. She settled into her seat more comfortably to review the evidence again, with her hoof rubbing between her legs.

Author's Note

Happy Hearth's Warming in June, ya filthy animals. I was busy back in December with running Jinglemas. So you're getting this now.