Is it possible...?

Yep! There are tons. link and link

The Nexus Sr. caught my attention, but I thought that it could only be used in BOTH partners, instead of both shafts in just the receiver. Thanks a lot =]

No, both shafts do not go into the receiver. One goes in the giver, and the other into the receiver.

Oooh =\ I was just looking for one where both go into the receiver.

Oh! Okay. Your post was a little unclear, but now I get what you're saying. link is one. You could opt for a buttplug and a simple dildo for vaginal penetration.

Ooh, I just reviewed the toy you linked to. It's okay, but on the small side. I've tried the (buttplug + dildo) and (dildo + dildo) combinations, and for me that's too much to keep track of for solo play. It might be okay with a partner, but I had liked the idea of "synchronized" thrusting with that toy, so to speak. If only it had been a little longer and thicker... Anyway, that particular one is not harness-compatible, and I don't know if I've ever seen one like that that was harness-compatible.

Adonis, do you think your receiver would prefer "synchronized" or "non-synchronized" sensations?