MASTRUBATOR -CLEAR CUP

The clear cup lets you actually see what's happening, which I didn't expect to enjoy as much as I do. Loosening the vacuum by lifting my finger gives a totally different feel than keeping it sealed, so you can dial in the suction.

Covering the air hole with my finger really does change the whole feel, the suction builds up fast and you can dial it back just by lifting off. The clear cup is a nice touch too since you can see exactly what's happening.

Wasn't sure the little air hole would make much difference, but covering it with my finger changes the suction way more than I expected. You can go from barely-there to seriously tight just by how much you seal it, which makes longer sessions a lot more interesting.