Dean and Cas have been dating for a while now, secretly, but what will happen when Cas' mom and Dean's dad gets married and they become stepbrothers?

Castiel and Dean have grown up together since they were four years old. Now the two have become completely different from one another, one being a punk and the other a jock. Yet nothing stops the two from being the best of friends. When a drunken night in a camping tent turns their whole relationship upside down, will their friendship survive? [FURTHER DESCRIPTION IN FIRST PART]