Whew! Short, sweet, and scorching hot! I absolutely love that Neville is getting off on the fantasy of exerting (sexual) control over Snape. It just makes so much sense somehow. Guh.
A rhythm now established, he caught the button between his teeth, rolled his tongue over the grooves and edges, sucking on it hungrily, though any trace of its former owner had long since been washed away.
That's such a great line!
After a moment's consideration, he supposed not; only a lifetime of repression could explain the man's attitude.