I have a double vibrating egg, the cheap chrome kind connected by a wire to a battery pack, except there's two separate eggs each on their own wire.
I bought it intending to put one in my pusspuss and one in my ass. And, as long as I don't mix them up, that's fine, as far as it goes. I came decently quickly with one in each hole and rubbing my clit.
Next, I thought to do the same but wearing a diaper, and leave them in all day. That was fun for a while, but the wire coming out of my pussy started to irritate me.
So the next time I wanted to try it, I did as follows: I put one egg in my ass before applying barrier cream (so I didn't get any zinc paste in my ass). Then I opened a diaper, and with a male adhesive incontinence shield (I use these as pantyliners, they're much more absorbent and cheaper) I sandwiched the other egg between the shield and the front of the diaper so as to be near my clit. That's how I'm sitting, writing this. It's currently off because it feels just too glorious for me to be sitting here typing when it's on. I encourage you all to try it!
It strikes me that this technique is applicable to men, trans women, anyone... I can get off from being vibrated through a diaper, but so can men I've known. It transmits vibrations well and I think it's a kind of stimulation the penis can enjoy just as much as the clitoris.