He didn't even know that he knew as much about the subject as he did when he opened his mouth. Mum had told him once, ages back, that teaching stuff to others made it stick better; maybe she was right. Or maybe he was just a genius.

His girlfriend and her lips certainly thought so. A huge grin split his face as she pulled away from the kiss and, had she allowed it in that moment, he'd have easily gone on ahead and grabbed her and snogged her until they were both tossed out of Study Hall, likely with a detention to each of their names. Instead, he watched her for a long moment, a sigh escaping him before he tried to get back to his own work.

But, the genius suddenly couldn't remember what he'd just explained to her, which was lame as he needed that same information for his own essay. Frowning, he reached into his bag to pull out another sugar quill, nibbling at it as he reread the passage in his book and then put his quill - his non-sugar quill - to parchement and began to scratch out his own thoughts. It took him more effort than he preferred when he wrote, at least if he wanted it to be legible. Some older year had once said something about a spell that would help to make ones writing easier to read, but he wasn't sure if that had been a joke, nor could he remember what the spell was called. So, he just had to live with his inability to write well. 

He wasn't done with his essay when Lizzie was speaking; at first he didn't entirely get that she was talking as he'd rather disappeared into a zone. "Working," he commented, still not entirely catching that she was wanting a snog. Right now. Something he'd wanted far more than studying only a bit ago.