"Knock-knock," I yell, feeling weird just walking into Emma's house, even though she told me to. I hear water running somewhere in the apartment, so I walk in and sit down on the couch. I drop my messenger bag filled with takeout sandwiches, and look around. I love that Emma keeps the glass I gave her in a prime spot where it gets the sun. It's the focal piece of her entire apartment, and I smile, knowing she's thinking of me basically any time she's looking around her living room. I also ...