Butt Plug-Inflatable Black Fist

A realistic fist-shaped butt plug in thick black latex that inflates to double its volume once inside. The solid foam core gives it enough structure for insertion, then the hand pump lets you increase the size gradually until you're properly stretched.

The tapered fingers make entry easier, and the quick-release valve on the pump means you can deflate fast or slow depending on what you need. At minimum inflation it's 7.5cm diameter, but you control how much further it goes from there.