The hierarchical difference between them was vast, an abyss so unfathomable that the mere idea of them being together, fighting, or anything of the sort was almost a disrespect to the logic of demons. A queen and a mere plebeian, something that, frankly, in a demon society, was just sickening. However, in that moment, the chasm between them had been completely erased from existence.
During the combat, Sapphire focused her entire existence on guiding and shaping him. She wanted more than to teach skills or show technique; she wanted Vergil to absorb the essence of her experience, to immerse himself in her mindset, to feel the extent of what it meant to be close to her, and what she sought from him.
In doing so, Sapphire didn't realize she was giving away much more than she intended: Vergil not only absorbed the lessons of combat but also experienced the deep layers of Sapphire's psyche, touching parts of her soul that were hidden even from herself.