About two months ago, I bought a Tongue Joy vibrator for both of us. This is a tiny vibrator that comes with three stretchy plastic rings sized small to large. The rings hold the vibrator on your finger, your tongue, or a handy penis. (Batteries are included. Penis sold separately.)
My wife goes freaking mental with the device. I love pulling it onto my tongue and eating her out, and then removing it and sliding it onto my dick. When I do, it rides up and onto her clit during full insertion, which is a thrill for both of us. It's great to get a blowjob with her wearing it, and she loves to diddle herself with it on her finger. (I love watching her do that.) :cool:
She has two other vibrators, but this one is the best. You can see the manufacturer's webpage here.