It's part of her charm. [And he would have said the same thing even if they hadn't been related. He genuinely believes it.]

Leia needed a Tian tether and there's not exactly a lot of us. [He smiles softly.] Why would I trust her to someone else when I can provide it? It just made the most sense.

[Plus he's just been trying to help all the Hebas he's close to, though he's going to end up paying for it sooner rather than later.]