Firstly, as favor from Tia that came in the form of a loan from the crown. Something about a 'newly minted fund to help the dimensionally displaced', though I'm were pretty sure she was just being nice. She seemed to enjoy having a new, candid penpal though, and an opinion on Ponyvilles usual shenanigans that wasn't from Twilights... particular view. I didn't interact with Luna as much, but she took an interest in my limp in one of the few times I spoke with her while in Canterlot. Apparently prosthetics aren't all that common in Equestria, go figure; though she took significant interest in my past, considering her more militant views. I like to include little P.S sections at the end of my letters to Tia for Luna. 