Not a bad choice. It's silicone, so it's hypoallergenic and can be cleaned and sterilized. You could easily interchange it, just make sure it is sterile, especially going from you to her.
The reviews say it gives a great prostate massage, and that's the stimulation you're looking for on you. Also from the look of it, the Pro Touch Plug would give good g-spot stimulation too - from the shape and angle.
I think it would work for the purposes you're looking for.