Handing you (yes, you!) or your penis-owning partner two sides to dive into, PinkCherry's Realistic Dual Ended Stroker is petite, portable, and VERY pleasurable.
The dual has (surprise!) two sides; one's a tight little butt, and the other's a pretty pussy. In between, you'll find and feel some sexy texture that grips and clings like real skin. Keep one side of the discreet case closed for more friction, or open 'em both for more room.
The TPE (elastomer) and ABS plastic PinkCherry Realistic Dual is body-safe, easy to clean (use soapy water or a good toy care fluid/foam), and good to go with any water-based lube you love. 
The Dual is about 4"/10.2cm penetrable