For me it is the Tenga Flip Zero EV. The two motors, lube and all the elastic discs inside make me cum in about 20 seconds flat. Not one to use if you are wanting to enjoy the ride, but if you need/want to cum in a hurry, this is one to try.
usstore.tenga.co

FLIP ZERO EV (Electronic Vibration)
A New Generation of FLIP ZERO is Ready To Rumble! Vibrating Cores within the elastomer sleeve bring sensations from another world to your hands.
