Yes, you stay after

"I bet you know why you're here, John" says Lila, as you walk into the room.

"I sure hope so!" You whisper to yourself, grinning.

"You're here because you failed your latest test..." she begins.

Your grin dies on the spot.

"... the test of not-making-your-teacher-horny, that is." she concludes.

"Come again?" You say, not sure whether or not you heard correctly.

"With pleasure!" She says, and yanks off her dress, revealing that she is wearing white stockings, dress shoes... and nothing else.

You fall into her chair, stunned, and whip out your dick, which is hard as a rock from the sight before you.

"Big boy." she teases, and jumps into your lap.