A type of small chastity cage designed to invert or push the penis inward toward the body, creating a flat and discreet profile. This prevents erections and often hides the penis entirely. Commonly used in BDSM for denial play, sissification, or feminization scenarios.
They typically feature a tube-like protrusion meant for the urethra to aid in aligning and for peeing, it could even come with a catheter, but some are similar to flat chastity cage with the cage flush to the surface with no protrusion.
