I've added a few twists to the SCP, you can leave if you dislike the changes.

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Item #: SCP-3008

Object Class: Euclid

Special Containment Procedures: The retail park containing SCP-3008 has been purchased by the Foundation and converted into Site-██. All public roads leading to or passing by Site-██ have been redirected.

The entrance to SCP-3008 is to be monitored at all times, and no one is to enter SCP-3008 outside of testing, as permitted by the Senior Researcher.

Humans exiting SCP-3008 are to be detained and then debriefed prior to the administration of amnestic. Dependent upon the duration of their stay in SCP-3008, a cover story may need to be generated prior to their release.

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Description: SCP-3008 is a large retail unit previously owned by and branded as IKEA, a popular furniture retail chain. A person entering SCP-3008 through the main entrance and then passing out of sight of the doors will find themselves translocated to SCP-3008-1. This displacement will typically go unnoticed as no change will occur from the perspective of the victim; they will generally not become aware until they try to return to the entrance.

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SCP-3008-1 is a space resembling the inside of an IKEA furniture store, extending far beyond the limits of what could physically be contained within the dimensions of the retail unit. Current measurements indicate an area of at least 10km2 with no visible external terminators detected in any direction. Inconclusive results from the use of laser rangefinders has led to the speculation that the space may be infinite.

SCP-3008-1 is inhabited by an unknown number of civilians trapped within prior to containment. Gathered data suggests they have formed a rudimentary civilization within SCP-3008-1, including the construction of settlements and fortifications for the purpose of defending against SCP-3008-2.

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SCP-3008-2 are humanoid entities that exist within SCP-3008-1. While superficially resembling humans they possess exaggerated and inconsistent bodily proportions, often described as being too short or too tall. They possess no facial features and in all observed cases wear a yellow shirt and blue trousers consistent with the IKEA employee uniform.

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SCP-3008-1 has a rudimentary day-night cycle, determined by the overhead lighting within the space activating and deactivating at times consistent with the opening and closing times of the original retail store. During the "night" instances of SCP-3008-2 will become violent towards all other lifeforms within SCP-3008-1. During these bouts of violence they have been heard to vocalize phrases in English that are typically variations of "The store is now closed, please exit the building". Once "day" begins SCP-3008-2 instances immediately become passive and begin moving throughout SCP-3008-1 seemingly at random. They are unresponsive to questioning or other verbal cues in this state, though will react violently if attacked.

SCP-3008-1 is known to have one or more exits located within, though these exits do not appear to have a fixed position, making it difficult to leave SCP-3008-1 once inside. Using any other door besides the main entrance to enter the structure or breaking through the walls of the retail unit leads into the non-anomalous interior of the original store.

Since containment began 14 individuals have managed to exit SCP-3008. Following extensive debriefing all individuals have been administered amnestic and released.

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Incident 3008-1: At 00:37 on ██/██/200█ a human male exited SCP-3008, followed 10 seconds later by an instance of SCP-3008-2. SCP-3008-2 caught and killed the man before itself being terminated by armed response personnel. This incident represents the only time an instance of SCP-3008-2 has been seen exiting SCP-3008. A full autopsy on the corpse was performed; see 3008-2 Autopsy Log for more details.

The man was carrying an IKEA-branded journal seeming to document his time in SCP-3008-1, transcribed below verbatim.

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Twists I've added:

SCP-3008-3: the extremely attractive version of both genders of SCP-3008-2.

SCP-3008-3 are available in both Genders, and rather than killing humans, they're there to assists the humans in WHATEVER they may need, from fighting SCP-3008-2 to even helping humans with their sexual desires, SCP-3008-3 have Privates like any normal humans, both in their respective Genders, and they even have mouth and tongue specifically for it but they never talk, they can moans intimately during intimacy but they could never talk.

Purpose: The purpose of SCP-3008-3 is quite Ironic, their role is to involuntarily produce more SCP-3008-2, it's been theorized that SCP-3008-3 is the one who gave birth to all SCP-3008-2. by performing intimacy with humans, more and more SCP-3008-2 is produced, there's only 1 in 100 chance where a single SCP-3008-3 is born out of another, they give birth not like humans but like animals, as in they lay eggs the size of a bowling ball rather than producing fetus like humans, and once a week, they would lay the eggs somewhere random and leave it there until it matured on it's own.

Appearance: SCP-3008-3 appeared to be a very seductive version of SCP-3008-2, surpassing many, if not, all humans in terms of physical attractiveness, and furthermore, upon engaging in intimacy with Human, they'll know, mold and shifted how their human mate prefer them to be appeared as, whenever and however, whether it's muscular, curvaceous or even both gender at once, like a female SCP-3008-3 with male's genitalia.

Biology: They don't appeared to be in need of sustenance, and in the account of them being torn apart by SCP-3008-2, a small piece of them that's closest to their human mate can regenerate but depending on the severity, it may take some times, from hours to days, however, at night, they tend to be very insistence and forceful with carnal desires, they would force their human mate to make love with them until they're satisfied, which would mean to make them climaxes at least 5 times before they calmed down, also, despite their very strong sexual drive, they have no interest in other SCP-3008-3 or SCP-3008-2 at all, only Humans.

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Armors and Weapons:
Very rare and founded hidden all over the endless complex, it is usually within a hard case and the contents are random, from armors to pencils, knives, swords, guns, explosives and even transportations vehicles, the only downsides is that you must assembled everything aside from the ammunitions yourself but it does comes with instructions and all the necessary tools you need.