Let's hope you have plenty of harmonizing aspects to bring you together, because this aspect will really bring out your friend's rebellious side and your own urge to dominate them. You'll both be even more strong-minded than usual, and you'll both focus on trying to get your own way, which, of course, won't always be possible. Whenever they think you're being pushy, your buddy will become openly rebellious against you.
You, on the other hand, will use more devious or manipulative -- but no less powerful -- means to push your agenda, which will include trying to change your friend into the person you want them to be. Change and personal evolution, in fact, will become a serious focus of this friendship, especially if you two know each other over a long period of time. It will work best between you if you can learn to afford your friend the independence they need.