You'll bring a sense of excitement and unpredictability to your friend's life. With you, they'll see possibilities they never considered before, and they'll enjoy your spontaneous way of doing things. Of course, your unpredictable quality will be based on something real -- an unwillingness on your part to be pinned down.
You could really shake things up for your friend, shocking them into a new reality, and liberating them from previous conditioning. Socially, you two should have a lot of fun together. There will always be a feeling of excitement and spontaneity when you're together, as if anything could happen -- and you're likely to get into plenty of adventures together. You'll want to introduce your buddy to your friends and get everyone together for fun times.