Ah. So this is how Byleth has chosen to further break down his walls. The man knows that words aren't Felix's strong suit, that it's always much more difficult for him to explain or admit something - particularly something personal or private - than just show it in his actions.

But he can't take any actions right now.

He squirms a little at the teasing, despite his best efforts. "I...ngh." He closes his eyes, still facing away from Byleth. "I want you to fuck me hard. And..." Goddess, he hates this, but if he can't say it out loud then the professor won't do it. "Without touching me." His cock, he means. "That's...I really want that."

He feels like he's stuck his face in a furnace.