The Demon from within

This oneshot takes place after the events of the Season 4 finale, Freedom, but occurs before the encounter with the Kraken.
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The prologue starts as Team Witness heads to the underbelly of Sleepy Hollow; it was thanks to Molly Thomas' vision and Gavin's encounter with an archaic book about witches/warlocks while he found it in a waste basket during his run. According to both resources, the team came across an occult that was headed by Roman Castavet, or rather named Steven Marcato. There was actually a woman named Rosemary who just gave birth to a demon baby called Adrian who's supposed to be the son of The Devil. However, the group was prepared and while they were fighting off the worshippers, Gavin recited and planted the Devil's Trap which sent both Adrian and his mom to Hell.
It was a solid victory, though Gavin seemed preoccupied and looked he was about to go into shock. He went into his apartment to relax a bit, with Jenny thinking it was the awe from the experimental spell. But instead, he was being harassed by an inner voice he recognized as his legal guardian, Loilita Micholi. He contacted both Jenny and Ichabod who're heading back to Washington DC and realized she died a week ago. She was actually a vengeful spirit inhabiting and torturing Gavin's hapless body and mind.
Jenny decided to comfort him while Ichabod gets help from Chief Turgado. He said a ritual must be done to help exorcise the demon who had escaped the Final Judgement, and this was what she wanted to do since they both had a dark past and hated each other so much. Turgado gave him the run-through that he must merge with Gavin's mind. They both must be asleep and have a strong bond in order to combat the wrathful apparition; however, he has to hurry or else...
Gavin was in severe pain as he had deep abrasions and soreness through his body. Loilita was doing more damage until Crane arrived with poppy milk. He did the spell and he wound up inside Gavin's head. He saw his mind had holes in the ceiling, there was a pit of rapid-firing sparks, and Gavin's cerebellum looked ten years younger. He made the Devil's Trap from his eidetic memory, and soon came across Loilita after one of the neon blue neurons collapsed. She chastised him and Gavin for having him involved in a farfetched cause, even though it was his own will. She was about to attack the cerebellum until Crane stopped her by making an offer, to exchange his own body to spare Gavin's life, though kill him from the outside while still being a restless spirit. She accepted but was encased in the trap he set up. Crane recited the incantation Gavin used earlier, and Loilita was vanquished.
Crane decided to stay with Gavin while Jenny left. The next morning, Gavin explained as to why he left and pursued a new life. It was so daunting that he burst into tears, where even he could turn corrupt and perhaps work for Moloch if it wasn't for his friends; the Freemason assured it was his own choice that got him here. And he also said that even though he never had the chance to witness the victory in the Revolution, he was glad that he saw Gavin's chance for freedom from his personal war.
== Trivia ==
* This was a oneshot that once crossed over with Rosemary's Baby; a movie Ikran hates! As she wanted Adrian to be either killed/sealed away restoring the world from Lucifer's reign, as well as killing off the Satanists!
*This takes place after the events of the Season 4 finale, Freedom, but before the arrival of the Kraken.
* Gavin's late soon-to-be guardian, Lolita Micholi, was made up, even though the name Lolita was a different name for sorrow. Indeed, she has during Gavin's past, making him leave for an apartment downtown. She's based on Ikran's ex-stepmom who has roughly been so power-hungry and abusive to her.
* This was a sort of origin story of Gavin, such as how his brain was undeveloped, and was suffering from his guardian's abuse/neglect.
* The technique of the Devil's Trap was inspired by Supernatural A series Ikran encountered after the 2016 Comic-Con; she was hoping SH would be in it, and her first episode was Route 666. But she quit officially by Season 7.
* Her favorite characters in the said series are mostly Sam and Mary Winchester, whom you'll see in a later fic as cameos.
* There was an excerpt from Hell: The Devil's Domain, a documentary from the History Channel. As well as a Phantom of the Opera song, That's All I Ask of You; a song Ikran heard in her 2002 spring choir concert in middle school.
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