Per 
Special Containment Procedures: SCP-5xxx is to be kept in a Standard 2m x 2m x 2m Scranton-Lang Anomaly Dampening Enclosure. SCP-5xxx is to be fed, walked and groomed by Site-44 Class C personnel twice daily. Any personnel working with SCP-5xxx are to refrain from physically touching SCP-5xxx to prevent activating it’s anomalous effect. SCP-5xxx is to be given food and water twice daily through a dispenser. This dispenser is to be refilled once per month by trained D-Class personnel. Sanitation is to be provided via a mobile cleaning robot. Litter is to be replaced once per week by trained D-Class personnel. While human personnel are in SCP-5xxx, the containment chamber should be filled with a gaseous form of Gabapentin, in order to induce a state of sluggishness in SCP-5xxx. Under no circumstances should any personnel make physical contact with SCP-5xxx whatsoever.
Description: SCP-5xxx is a small, black house cat (felis catus). SCP-5xxx’s anomalous effect will manifest when it sits upon a human. Upon physical contact with a human, SCP-5xxx will rapidly gain infinite mass, behaving similarly to a black hole, creating a gravitational pull around itself that in turn increases SCP-5xxx’s mass until it stops receiving physical contact or when SCP-5xxx gains enough mass to spaghettify any mass nearby. It appears that contact with those with a strong attachment to animals can strengthen SCP-5xxx’s effect exponentially [See Incident Report 5xxx-01]. Contact with non-human entities, sentient or not, does not manifest SCP-5xxx’s effect [See Experiment Log ██]
Incident Report:
On 19/04/████, SCP-5xxx breached containment and caused a chain reaction of events nearly leading to a VK-Class Physics Restructuring Event, resulting in 407 casualties, of which 86 were killed and 321 were injured. Although much of the internal documentation at Site-44 was destroyed during Incident-VK-5xxx-01, A log from the on-site AI was successfully generated and stored.
Investigation revealed that Jr. Researcher Tracey ██████ was, prior to Foundation recruitment, a veterinarian. How such a poor choice was selected for enactment of Procedure 5xxx-Alabaster is currently unknown. The on-site AI, a newer, trial version of the CASS software, responsible for human resources and site management, was decommissioned after the incident, in order to diagnose any possible issues that caused the malfunction.
