When you squeeze the hole, the fellatio hole will be forced to open the hole. The most important feature is that the "immersive movement and stimulation" realized by two skeletal plates made to simulate the human body. Your grip and piston movement will be transferred through the skeletal plate to the whole hole and your mouth will be "oh hen! It opens and tightens your throat tightening... Unlike conventional fellatio holes, you can enjoy playing with it as a lively experience. The dental part is made of a real shape down to the back of the teeth and is soft enough to be bent with your finger. It also reduces pain when inserting fellatio holes. We hope you want to have a live mouth filled with seriousness!