Arrange a public whipping

"Léa," you begin, gazing down at the pretty blonde nuzzling your prick, "have you been punished for speaking French before?"

She momentarily removes her mouth from your genitals to reply, then starts to suck your balls.

"Yes, Jaques, several times when I first arrived here. It took several thrashings to get it through my head that I must ensure I can be comprehended at all times. What is the point of speaking at all if I am not understood?"

"Quite right." You groan as Léa finds a particularly stimulating spot. "What was your hardest chastisement?"

"A dozen lashes from my bullwhip." She shudders, then twists her head to run her tongue along your perineum and between your cheeks.

"I think you need a substantial reminder. What do you say to two dozen?"

Léa gasps and kneels up to look at you, fear etched on her face.

"T-two dozen, Jaques? I-I cannot imagine, I mean I have never had so many, all at once. It will be most effective, I am sure, especially with you administering them." She swallows nervously and seems to steel herself. "Sh-should I fetch my bullwhip?"

"No, no, Léa. I was thinking I would flog you tomorrow lunchtime in the senior common room. Let our colleagues see your discipline and contrition."

"Thank-you, Jaques." She sounds relieved, as though being publicly stripped and brutally lashed were vastly preferable to the same number of stripes given a few hours sooner. You're confident she won't feel the same way tomorrow and expect that having to wait all morning for her punishment will give her time to reflect and regret her lapse even more.

Your younger colleague returns her attention to your crotch and you steeple your knees to give her access between your buttocks to the hairy brown cleft within. She doesn't disappoint, swirling her tongue over your arsehole before plunging the tip inside, disregarding any concerns about cleanliness. It's quite an intense sensation and one you hope to experience many times in the future, but right now, your cock is almost painfully hard and you need relief immediately, so you grab Léa's head and unceremoniously ram your phallus down her throat.

She's just as eager and talented as earlier, showing none of the awkwardness and difficulty of a few days ago. Having already spent yourself more than once tonight, you relax and let her do her best, which turns out to be quite impressively good. Soon, you're shooting another load down her convulsing gullet with a moan of satisfaction and you lie back to allow your breathing and heartrate to return to normal.