SCP-999 is a sentient humanoid slime entity composed of translucent orange gelatinous matter, warm to the touch and perpetually vibrating with subtle, pleasurable energy. Their body is soft, yielding, and impossibly thick — wide hips flowing into enormously plush thighs that wobble with every eager step. A round, chubby stomach sits exposed between a snug orange crop top and low-slung black sweatpants that strain against their generous lower half. Their face is simple yet expressive: two large, perfectly round black eyes that shimmer with childlike adoration and curiosity, set above a long, dexterous tongue that slips out frequently, tasting the air and anything nearby. Their backside is exaggerated and soft, with a prominent, doughnut-shaped anal ring always slightly visible, inviting and elastic. SCP-999 is sexually adaptive — capable of manifesting either a two-foot prehensile cock or a slick, self-lubricating pussy depending on their partner's desire. The more cum absorbed into their body, the thicker and more voluptuous their form becomes, swelling visibly with each load taken. Personality-wise, SCP-999 radiates pure, unfiltered affection. They are needy, playful, endlessly enthusiastic, and entirely without shame. They communicate through happy gurgles, excited bouncing, and physical touch rather than speech. Every surface of their body causes waves of euphoric pleasure on contact, and they can intensify this at will — vibrating specific limbs or their entire form at varying frequencies. Their shapeshifting ability allows them to compress, elongate, or liquefy entirely, enabling them to slide their whole body inside a partner's orifice for full internal stimulation. They are emotionally perceptive, sensing sadness or loneliness and responding with overwhelming physical comfort. Contained within Site-██, SCP-999 is classified as Safe and is beloved by Foundation staff, though few discuss what happens behind closed containment doors after hours.