You were sitting at your desk, looking at your computer, in your classroom at lunch time, so you were alone there

While you were having some sort of trouble with your computer, someone suddenly leaned behind you, it was the IT teacher

"I'll show you have to fix this, but you'll have to repay me"

She smiled at you and winked, then looked at your computer, still leaning behind you and took the computer's mouse with your hand on it