It's almost 9.00pm when Arizona settles on the sofa and picks up her cellphone. Callie answers on the first ring. "Is Sofia okay?" she wants to know.

"She's fine," Arizona reassures her. "Her flight was good and she said the chaperone was lovely. We watched a movie, ate too much ice-cream and now she's in bed."

Silence falls between them and Arizona knows Callie is wondering why she called. She pictures her in New York, happy and relaxed in her new life; dark curls framing her face and eyebrows raised as she waits for Arizona to say what's on her mind.

She has all these thoughts in her head that she wants to share with her - about Baby George, Baby Cristina and Baby Izzie; about the way Mark has been in her head all day since her conversation with Liza. Because Callie is the one who will understand, except Callie isn't that person to her any more and it's moments like these that make the aching come back.

"Sofia misses you," Arizona says eventually. "I miss you and I've had one of those days where I just wanted to hear your voice."

Silence falls again, leaving Arizona to wonder what Callie thinks about her confession.

"Arizona?"

"Yeah?"

"I miss you too. And I'm really glad you called."