Twelve years ago, I slept with my best friend's little brother, and we've been sneaking around ever since.Arlo is my weakness.I sat back while he went to college...I watched on proudly while he travelled the world...I gritted my teeth when he dated other people...Because he's only mine when he visits home.That's the deal.But spending time with him during his brother's wedding weekend has made me realize friend with benefits is no longer enough.I want more.