(what is an onacup?)

original: "Special valves create a virtual vacuum inside the cup, to deliver an amazing sucking sensation. And, the unique pinched-in shape helps to achieve an unparalleled tightness. These advanced features combine with an arousing “slurping" sound and vibration to give you the feeling that you’re enjoying a real deep throat experience."
We say: sucks great and is nice and tight.

Onacups are ment for single-use and can only be used a few times.