At first I didn't like Ruenti, because he was treating her as "just another Sperado", ignoring her personal circumstances or at the very least ignoring that his mother, the Duchess, has chosen to take her in under her wing (and he should respect that); however, seeing him geek out at Leslie's intellect and breadth of knowledge only to try to (unsuccessfully) rein himself in, is adorable. I hope he realizes the truth of the matter and remains the hot-headed but nice brother he can be.