The Tenga : Original Vacuum Cup is better than a real deep throat, the special design allows you to hold the device for the most efficient stroke. The design has an inner tube that is very tight and has edges to make the most eccentric simulation one can have. In addition to that, there is a lubricant ring that holds the lubricant and lubes your penis.
But make sure to use some water-based lubricants before sliding your penis into the cup. The sex toy is skin-friendly and easy to clean.