Some mild experimentation.

You sit in your office, looking at the ring sitting on your desk. It's been 20 minutes since John left, but you still haven't put it on.

A knock at the door gets your attention. You look up and see that the door is slightly cracked open already, so you wave at the sliver of face that you can see through the opening.

The hottest redhead you've ever seen walks through the door. Tight jeans, perky little breasts in a form fitting t-shirt, and the world's cutest smile make your cock harder than it’s ever been. Perhaps the knowledge of what you can do to this girl is affecting your judgment, but either way the desk in front of you is doing you a huge favor by hiding the very obvious tent in your pants.

"Hi!" says the girl, "I'm Jenny McAllister! I wanted to meet you before my first class tomorrow. My sister says it's good to meet all your professors.”

You reach out to shake her hand. Her handshake is firm, but the softness of her skin is frustratingly distracting. As you pull your hand back you drag it along the desk and snag the ring.

She sits down. You don’t say anything. After a couple of minutes she says, "So. Um. Is there any advice you can give me for doing well in your class?"

"Well..." you stammer, “Study hard. Pay attention in class. Don’t party too much.”

“Un huh,” the pretty girl nods her head and smiles, obviously expecting more. When you don’t say anything she starts slowly standing up. “Well, this has been-“

You slip the ring on and think, “Stay!”

Jenny plops back down. “It’s been useful! Anything else you can tell me?”

You concentrate on the girl pulling her shirt up, but not noticing what she’s doing. She pulls it up, revealing small but perky breasts in a lacey green bra. She doesn’t notice her own actions, but she quickly notices you staring.

“Notes!” you say. “A lot of students think that notes are useless because they’ll never read them. But… uh… even if you don’t read them later, taking them in class will still make you remember better.”

Jenny smiles with a bit more satisfaction. “Okay! I’ll remember that. Thank you very much, Professor.” She gets up and heads for the door, still holding her shirt up.

You quickly concentrate on her dropping her shirt. She does so, then waves to you as she leaves. You tense as she closes the door, waiting for her to scream.

No scream. Apparently the behavior that she remembers wasn’t strange enough to get you in trouble.

You write down the name’ Jenny McAllister’ on a notepad. Those really were nice tits.