The Onadroid Kiwami Onacup is the best kind of onacup masturbator: a minimal design yet plenty of options for different degrees of pleasure. It comes in two variations, each with its own pattern of stimulating inner nubs and ribs, ending in vacuum chambers that will wrap snugly around your thrusting member. But it keeps on giving: you can use the onacup as it is or also take the sleeve out from the cup holder. This makes cleaning easier and lets you use the masturbator as a regular onahole-style toy.
The Onadroid Onacup features: