Professor Lehnsherr knew the expression on his face alone was enough to be considered illegal, knew his job, reputation, hell entire life was teetering dangerously on the edge of Smirking & Leer falls. If any one knew the thoughts currently saturating his mind as he stared down at his favourite student he’d be out of any educational job for the rest of time, and probably put on some kind of list down at the police station. He knew all this, yet it still didn’t stop him from looking that way all the same, and it didn’t stop that jolt of pleasure seeing Charles glance up at him in that awkward shy teenager way, knowing full well what that expression meant. After all, the boy flirted with him enough in and outside of class, Erik wasn’t stupid.
Still, he wasn’t doing any harm, thinking it wasn’t illegal.
Not yet anyway.
Part 3 of the Teacher/Student AU. Part 1, Part 2. Part 4