(Yeah, that dragon doesn't really care about anything anymore, so good luck coaxing him into breeding-- maybe in time.)

It doesn't hurt that Temeraire and Laurence together are unstoppable, and all of their flank protection seems to act as an accessory-- one of them is periodically glancing up to check for threats from above, and Laurence's reaction to being frightened from above is probably to turn on whatever's coming and yell a warning, as in sailor training for unexpected visitor. As a dragon, that probably comes out fire the first time the hapless training assistant scares Laurence as is required.