Will you punish Imogen for inadequate tipping?

Yes, but not now

"I am very disappointed, Imogen." Your words are like a bombshell for the young stunner. "I expect you to make your best efforts when tipping and that performance was not acceptable."

The brunette is shaking like a leaf and starting to hyperventilate as the nightmare prospect of further chastisement flits through her mind. It's clear that she can't take much more and you're tired in any case, but this certainly needs to be addressed.

"When you come over next week, I'm going to take you to the cellar again to repeat tonight's whipping and then you can try again—"

"Thank-you, thank-you, oh thank-you, Professor," the poor girl is pathetically grateful for the chance to be thrashed to a pile of burning agony for your pleasure and you're gratified that your decision seems to have been the right one.

"Clean up the cellar before you leave tonight, please. Quietly!"

The young grad-student is actually crying with relief as she jumps to obey, but when her toes touch the carpet, she realizes that the welts on her feet have only become more tender over the last few minutes and she collapses to the floor. Rather than give you a chance to castigate her further, she crawls from the room and down the stairs, fulfilling your admonition not to make any noise which might disturb you. Indeed, so exhausted are you after your thrilling day that you're asleep as soon as you wriggle between the covers.