Only child cousins

For as long as I've known, my cousin (18F) and I (13M) have been best friends. We see each other all the time... whenever we get the chance. We are both as close as we can be. We've always been the same height, so we go to each other for help. Do we ever do stuff we shouldn't be doing? Yeah. We just say its okay because we are cousins. We hang out all the time. Woohoo.