The Demon Princess, with an unpronounceable name so long it'd take an eternity to fully say out loud, so Savannah was just calling her Lydia("Naming a Demon Princess after your ex wife is so tacky" Katerina said with disapproval), sat on her throne in her infernal realm, which was slowly merging with our realm.
The exsanguinated remains of some of her cultists(From another version of Earth she had long since ravaged) were laying on the floor all around her, their blood trailing down from one of her mouths, pooling on her top most pair of breasts, soaking her emerald green dress. One pair of glowing purple eyes glared sassily at the red haired human sorceress and her companion.
"Old trick" Lydia said, "how I got through. The more you witches travel between worlds that don't belong to you, the thinner the barrier becomes. All I had to do was whisper in the right ears, make some empty promises to some foolish teenage girls, and tada, you foolish mortals suddenly have a new Queen. Now, about my terms..."
With a nod from Savannah, Katerina pulled out a specialized magnum from a pocket dimension and perforated the demoness with a casual brazen nature that wouldn't be out of place in a John Woo film.
"Holy bullets" she said, her tone of voice Katerina's typical deadpan.
Lydia's new gaping holes oozed disgusting looking green blood.
"Much good they may do you" said Lydia arrogantly, suddenly on her feet. A gentle breeze let the Occ-Ops agents that they were dealing with a speedster.
Lydia tried using that superhuman speed on Savannah to crack the bitch's spine, but was met with a protection spell so fierce, it blew her back twenty feet.
Katerina shot her again, this time with a shotgun that came from seemingly nowhere.
BOOM!
"Stupid" said Lydia. "This could have been quick and painless, but you whores chose slow and dreadful. If I were you..."
Katerina then shot two of Lydia's four arms off.
"Hey!"
Then one of her legs.
"Damn you! Now wait just one bloody minute... AAAGH!!!"
Mother Russia shot the demon once again with holy ordinance, this time cutting her demonic body in half. The animate part was ranting on the ground, her intestines laying out openly in front of her.
"YOU EVIL PAIR OF BITCHES! I SWEAR TO GOD THAT I'LL BITE OFF YOUR TITS AND FEAST ON YOUR HEARTS!!!"
"How about that?" Savannah asked her partner. "An actual demon who believes in God."
"Uh huh" Katerina said as Lydia shrieked.
Savannah said some magic words, and Lydia's essence dissolved into nothing, though it was possible that given her office as a Princess of Hell (As opposed to a regular, rank and file demon), she may at some later time reform herself.
**
The two lady agents were back home by late afternoon.
Hermione, the sweetheart she was, asked them about their excursion with genuine interest about their morning, having total faith in their ability to save the day, while the real Lydia just rolled her eyes and shook her head.
"It's fucking Christmas, it's no day for horror stories."
"It's no day for a potty mouth either, dear" said the pregnant Hermione as she winked at Savannah.
The kids meanwhile were having their own fun...