The reality is likely one of two scenarios:

It is that the original file was named FCV_Giantess_of_8039s_Giant_full.jpg or .mp4 and became corrupted during indexing. No known major creator uses “FCV” as a handle. However, several Giantess artists use alphanumeric codes for their series (e.g., “GiantessZone” story IDs, “SizeCon” releases).

Below is a short story inspired by the common tropes of this genre: The Titan’s Mercy