A Secret from the Lecture Hall

I never thought I'd feel this way, especially at my age. It happened last week, during prep for a lecture, and since then it's been haunting me. I walked past one of my TA's office doors and... well, I peeked in, and there he was alone. Just the sight of him, so young compared to me, doing work... It made me feel things that aren't right to think about a student. I can barely admit this to myself, let alone anyone else.