Are there any other SCPs like this?
What I have so far is what is seemingly an ordinary massage table. The anomalous effects manifest when a vertebrate is placed on top of the table, after which a humanoid manifests in the vicinity of the table, subjects describe the humanoid as an ordinary massage therapist, while camera feeds show an unusually tall, transparent, violet humanoid with no defining features, and report a sense of comfort and feel compelled to lie face-down. Shortly thereafter, the humanoid begins to massage the subject, causing them to slowly elongate, growing additional vertebrae while the table elongates with them. When the subject and table reach a certain length, the humanoid disappears, leaving the subject permanently elongated, this causes no harm apart from the issues arising from having to live with additional height and vertebrae. The table slowly returns to its original size after the subject leaves.