[M]y partner lost a buttplug in my [F]ucking ass

The other day me and my partner were doing the deed. I had my head down on the bed with my ass up off the edge. He was kneeling on the floor behind me with all sorts of toys and we were trying out a new set of buttplugs I recently brought.
It’s a set of three different sized, silicone butt plugs with a different coloured gem on the flange of each one. They gradually go up in size, and since I am newer to butt stuff we started at the smallest end of the spectrum.
There was a point during play where the plug came out by accident. He asked me if I wanted to go up a size, being too afraid to try anything larger, I said no. He complied, when he put the buttplug back in it was swallowed right before his eyes and sparkling gem was engulfed by my sphincter. Immediately behind me I hear him gasp, followed by a “uh oh”