Neither do I. It frightens me, and I've read all sorts of weird things, including zombie!Severus Snape/Remus Lupin. I think that Temeraire fic would scar me worse.
The entire comm on LJ seemed to be het only, and I know how communities like that can be when you're the first person to post slash. You're totally right about Laurence only loving Temeraire, by the way, which is why I don't see him initiating a relationship with anyone. (Remember, JANE initiated with him, as well.) IF he's going to come to care for anyone else, it will only be through lots of work and the other person being too stubborn to give up.