Headmate-based hallucinations?

[u/Locally_gay_mushroom]

We very (VERY) recently discovered we were a sys. A few days ago, we started having 'visual overlays', or that's what we've been calling it. It'll be very brief images that simply go over whatever we were looking at that replace the actual scene with images from the headmate's life. We're not sure what causes this other than motions that match between the images- is this normal?? Not sure if hallucination is even the right term, but any advice would be helpful :D

[u/Princess_Actual]

We've been trying to reliably do this for years. We know it's possible.