The Professor couldn't help but overhear at one point. Not that there was much to overhear, though. No one knows how to keep their words secret than two lovers who perfectly know the hearing range of each other. But the whole scene spoke on its own, specially the reactions of all involved. It wasn't sure if they were blushing due to their scale color, but definitely was a tender component in their gaze and some hint at imminent giggles at their lips, suppressed with all willpower at their reach.