Maybe there can be situations where she has to help him on their field trips since he has mild haemophilia and has to take a lot of care not to get injured or he'll lose blood quickly, then she can help get him back to his house (this is the reason he doesn't go out much and has safety stuff in his office), he also has lots of traveling stories that he can tell her so that's CR for years

SMOL RODERIC IS SO ADORABLE yeah in his free time Lucian will give him books and teach him naturalist stuff... he's always welcome as long as Lucian is in