Special Containment Procedures: Development of containment procedures for SCP-4423 events is ongoing. Meanwhile, all such events are to be attributed to a unique form of sleep paralysis.
Description: SCP-4423 is a Tartarean-Class demonic entity that manifests during sleep paralysis. Although its appearance varies across manifestations, its voice remains the same (with speech patterns matching that of a middle-aged male).
During an SCP-4423 event, SCP-4423 will enter the victim's room and speak to them as if they were a young child. This conversation will inevitably turn to the topic of the victim's father. When the victim exits sleep paralysis, SCP-4423 will leave the room and demanifest.
Due to the lack of reported incidents (with only fifteen confirmed cases since 1997), the frequency of SCP-4423 events is currently unknown. While the extent of SCP-4423's interactions with the victims varies greatly, many seek psychiatric help following an incident.
Interview Log: In order to obtain an interview, Researcher Jack Patricks volunteered to be subjected to an experimental drug capable of inducing sleep paralysis. By using a prototype neural interface capable of translating thoughts into synthetic speech and a camera system mounted in his room, an interview was conducted after 77 consecutive days of testing.

Interview Video Log Transcript
Date: 14/10/2015
Subject: SCP-4423

[BEGIN LOG]
Camera set within Researcher Patrick's room shows the Researcher, a bed, as well as several posters on the wall.
[6 hours removed for brevity.]
The sound of a door opening is heard, followed by footsteps. SCP-4423 appears in the frame and sits at the end of Researcher Patricks' bed and crosses its hands in its lap. After observing Researcher Patricks for a period of 3 minutes, SCP-4423 touches his ankle and shakes it until Patricks opens his eyes.Researcher Patricks: Hello.
SCP-4423 jumps slightly.Researcher Patricks: I. Am. … Foundation.Researcher Patricks: You. Know.Researcher Patricks: Oh. Kay.Researcher Patricks: Why.Researcher Patricks: Questions.Researcher Patricks: How. You. Move.Researcher Patricks: Where. You. From.Researcher Patricks: No. Really.Researcher Patricks: William.Researcher Patricks: Oh.Researcher Patricks: Oh. Kay.Researcher Patricks: Sexual. Relations.Researcher Patricks: Oh. Kay.Researcher Patricks: How.Researcher Patricks: Explain.Researcher Patricks: For. What.Researcher Patricks: Step. Dad.SCP-4423 covers its mouth with its hands and gigglesResearcher Patricks: Yes.
SCP-4423 grabs Researcher Patricks, pulls him into a hug, and kisses his forehead. SCP-4423 laughs, tucks Patricks back into bed, and then exits the room.[END LOG]
Closing Statement: Following extensive interviews, Foundation researchers concluded that while he had passed through Las Vegas on 15/1/1992, Researcher Patricks' father has not engaged in sexual intercourse with any Tartarean-Class demonic entities1.

Addendum: Ten months after the interview, a photograph depicting SCP-4423, William Patricks, and Researcher Jack Patricks in formal attire inside of a church was discovered underneath Researcher Patricks' bed. The picture showed Researcher Patricks as he appeared when he was twelve and Patricks recognized the church as the one he attended as a child in Gettysburg, Pennsylvania.
Mobile Task Force Upsilon-11 was dispatched to the church and found a wedding announcement in the records for one William Patricks and an unnamed second person, dated 14/8/1999. No members of the clergy recall conducting or witnessing the wedding and Researcher Patricks has no memory of this event taking place.
Addendum: On 30/8/2019, Researcher Patricks received a postcard (postmarked 14/8/2019 in Oranjestad, Aruba) from his father.

Hey Jack!
Sorry that I didn't give you any notice, but your stepdad and I decided to celebrate our anniversary in the Islands. Can't believe it's been twenty years already. Maybe you can join us next year, if you can get away from that job.
Love, Dad
P.S. If you get a chance, can you check on Misty? That cat sure misses you and I don't want Mrs. Arnsdale overfeeding her again.

Compiled surveillance logs from the city of Oranjestad show William Patricks and SCP-4423 checking into a hotel and participating in other activities standard for vacationing couples. The current whereabouts of William Patricks remains unknown.

Footnotes
1. As of December 4th, 2015

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