There are ways to attach any suction cup toy to a fucking machine. So you could easily purchase a dog toy with suction cup, and use it with a fucking machine. I have a Lovense machine and I could do this but I haven't since the knot toys I have would be uncomfortable moving in and out. Further, the motor in my machine is not great so allowing the machine to "force" the knot of the toy into me would apply too much strain on it.