Make her not see you

“You can't consciously see or hear me,” you command Susie. “As far as you can see, Professor Porter is fully dressed and nothing odd is happening to her.”

Susie's head lolls for a second, just like it was doing regularly after her sixth beer last night. She recovers and says, “Hey, Dr. Porter. I'm so glad you're still here. I'm sorry I missed the test, I had a horrible stomach flu this morning.”

You whisper into the professor's ear. “Don't act like I'm feeling up your hot body.” You squeeze a breast for emphasis. “Just say what you normally would.”

Porter blushes, but with only a slight quaver in her voice she says, “Hello Susie. You don't look like you're suffering too much. Except maybe suffering from a hang over.”

You slide a hand from Porter's ass, around her shapely waist, and into her pussy. She gasps, startling Susie a bit.

The small girl looks tentatively at her teacher. “Uh... no. No way. You know me, study study study, no time for parties.”

“I didn't... AH!” The older woman's back goes rigid as you find her clitoris. She squeals for several seconds before continuing. “I... I didn't say anything about a party, just drinking.”

“Uh, Dr. Porter?” Susie pulls off her sunglasses, squinting at the lights. “Are you okay?”

“I'm... I'm fine, but your grade won't be if you keep missing tests.”

“Isn't there anything I could do to get a retest?” Susie puts her hands behind her back and pouts. She looks so cute most professors would just give her an 'A' and apologize for upsetting her. “Pleeeaaase?”

All kinds of evil thoughts run through your head. This could be a great way to humiliate the teacher some more. On the other hand, your cock is completely hard again.