Best Friends With Benefits

1.  My best friend and I frequently indulge our physical urges, but we're still just friends.
2.  He didn't want me to get my nipples pierced but he seems to like them even more than I do
3.  We often bite and scratch each other
4.  He's a lot younger than me, but people have mistaken me as younger than him
5.  No one knows that we've been physical.... that makes it even hotter!