this seems like the kind of thing he'd find v amusing.

Totally! :D

he were /Miles'/ dragon, and there is a truly terrifying notion, even aside from completely blowing Miles' cover.)

Miles with a very protective dragon is definitely a terrifying thought (and OH, OH, can you imagine Mark trying to fool Temeraire, and potentially forming an uneasy alliance (and while his Captain's clone is definitely not his Captain, I bet Temeraire would decide that this means Mark belongs to him anyway, and needs looking after...)

And he would definitely get along well with Tung, yes!