Cosette would be the death of Maxen's fragile heart. How could she come into his room without notice? Not that he didn't want to spend some time with her, but he needed the necessary preparation. He needed a brief ceremony to remind himself to control his perverse urges.
Although Cosette had already given her consent in the past, Maxen didn't want to break his promise to Conrad. Conrad might've given his blessings to Maxen, but on one condition. That was to preserve her chastity until they got married. That would be difficult to uphold, especially while undergoing this 'phase' of his life.
Maxen closed his eyes and breathed out. He peeled his back from the door, only to plant his palms on it. He hung his head low, eyes drooping until they were partially closed. His breathing was heavy, and the tension in his groin doubled.