She has a statement to make.

"Oh God that was so fucking good!" Diana moans happily as she shudders through the aftershocks of orgasm. You hold her warmth against you, your cock slowly softening in her tight wet pussy. When she finally stops panting, she pushes herself up from the desk, turning in your arms and giving you a smile and chaste kiss on the lips.

"That was so much fun Brian. I think we both needed that," she says, pulling off her sports bra and casting it aside. "I'm going to take a shower. We both have a faculty meeting coming up, and it wouldn't do to arrive looking all sweaty and disheveled."

You take her arm and pull her to you, kissing her hungrily. She doesn't resist, but doesn't respond with her earlier enthusiasm. After a moment she puts her hand on your chest and steps back.

"We must remember who we are, Brian. Despite what happened just now and how much fun we just had I'm still your boss. We have to maintain the proprieties, even when we're misbehaving," she smiles wryly. "Especially then."

"So are you saying this is a one time thing?" you ask, trying not to let your irritation show. You're used to being the one who calls things off, and you're unhappy at her sudden change of attitude.

"I'm saying we have to be very careful," she says calmly. "Don't get all masterful please Brian. I'm not saying this can't happen again, but it can't be a regular thing. We both have too much to lose." She steps forward and caresses your cheek with a gentle smile. "Don't mistake me Brian, I loved being fucked, and I'd love to be fucked again sometime, but we can't become a couple. Now if you'll excuse me I really need to take a shower."

She steps away from you and sways naked into the office bathroom, her ass twitching delectably. You watch until she shuts the door, trying to sort out your feelings.