My only guess is that they make them. Some gal pals of mine made one at a bacholorate party.
We bought a cheap clear jelly dildo (we were not gonna waste a good silicone one on the prototype)
Then we took a very long drill bit and using our hands, not attaching the bit to a drill, punctured the base of the dildo. We then grabbed the shaft and worked the bit up threw the tip.
Once the bit punctured the head we removed the drill bit. Them we took an enema tube and feed it threw the hole.
We then looked up ‘cum recipes’ and made a fake solution to place inside the sack portion of the enema.
We did not use it anally or virginally but it was pretty fun to squirt it all night.
For a body safe alternative a silicone dildo not composed of the duel density materials should work. I would imagine a duel density dildo would be had to work a drill bit threw.
Sorry I don't know where to buy one already made, but I hope this helps.