You'll have a powerful effect on each other in the ways in which you think and express yourselves. Your friend will be able to access and articulate your deepest, most intense feelings which could be an odd experience for you. But there's much potential here for personal growth and transformation, if you can convince yourself to be bold and face down those deep, subconscious feelings and fears.
You have much to offer your friend at this level, as well; your influence will help them focus and learn at a deeper level. You may try to dominate the conversation or push your buddy to talk about things they aren't comfortable discussing. But rest assured that through knowing each other, you'll come to know yourselves better than ever before.