Dear Victor,
Hope you're doing all right. I miss you like crazy. Visiting was all well and good, but I'm looking forward to having you home. You know the guest room is free for you for as long as you want it when you get back.
I'd say things were quiet without you around, but things tend to be pretty quiet with you around too. But I find I don't mind that as much as I thought I might, even if you don't like being dragged outdoors overmuch.
Anyway, I don't have much else to say but I miss you. And I'm proud of you, I hope you know that.
Yours fondly,
Ethan