Re: Kotegaeshi, help please
I think if you and your friend are able people and understand the natural risks of rough housing, it's great to try Aikido technique outside of the Dojo. I learned lot's and lots from doing this, I've also never broken anyones anything outside of the Dojo. Be smart, and figure out how your techniques work.
Aikido doesn't need anything extra to work, that you're not going to learn from 90% of the Aikido teachers out there. However you do need to take the time and figure out how you can use your techniques, that requires trying them, a lot, on lots of different people. Before you know it Aikido will seem simple and effective!