And now for the feedback:
So, yesterday after driving to my girlfriend's place (we live 3 hours apart, so we see each other on weekends) we unwrapped the package and tested the kit.
We started by having me lie on my stomach as she played a bit with my ass (fingers) to relax it. She then put the small dildo in the harness, and with the help of lube of course, started pushing it in/ pulling it out / keeping it in place according to my instructions. Doggie style didn't seem to work that well at that point, probably because I'm taller than her. It didn't take too much time to get used to the dildo, since it is only slightly larger than a finger, so she started going in an out, and we also switched to having me on my back. I could feel my prostate getting stimulated, which felt nice.
We then moved on to the larger one. That one took more getting used to.. Lots of lube, and keeping it still at times is necessary. The only point I felt some pain was when she had just entered me (and pushed it in), since I happened to move at that time and it got in deeper than I was ready. Anyway, after a while, she could slide in and out, and it was starting to feel good. We switched to the facing position again, and when she started stroking me at the same time, if felt GOOD. Being stroked makes the penetration much easier, somehow, and she could go faster and deeper. So, after doing that for a while I sensed I was ready to come.. The orgasm was really good, different that the usual because of the prostate stimulation..
So that's basically it (well there were more sex before and after on that day but that was old fashioned non-toy-enhanced sex
). It was interesting too to be more submissive for once, being the receiver, in a way.
Anyway, I'm sure we'll give it more tries soon, and perfect our techniques. But my advice is, give it a shot!