Fletcher had charmed the door to be locked when they'd fucked on his desk. Admittedly, Zach had been quite good with that, whether there were sound charms or not. Even if others didn't care, his father did. And while that wasn't going to change anything, Zach still preferred the man not to know. For very obvious self-preservation with a particular dislike for torture reason.
"Hmm," Zach thought about it. Even if someone realized, they weren't likely to ask who or check. And he was good at being quiet when he needed to...And the thought of Fletcher having to have normal conversation with someone while Zach's head bobbed back and forth on his cock... "Merlin, woman, you're going to get me all worked up," Zach teased back, partially serious.