Nikolai Regulus's Links
Diana is a nobelia he can rely on. Whether its his own health or his people's Nikolai knows he can trust her to rise to the occassion. He respects her and her word so if there's anything she needs or wants Diana typically gets it without a fuss.
She doesn't quite mind the man and giving him the business if he deserves it.Overall she likes helping him and his people and appreciates that he comes to her for consultation. If he needs help or his people have need she will arise to his call.