Yes, you make her take the deal

Diana does not notice your change in technique at first. It is subtle, but you know how to get her off and the swirling motions of your tongue are ones you have used many times before to give her multiple orgasms in rapid succession. She gurgles incoherently in alarm as she feels her arousal spike and her muscles clench. You have no doubt she would love to lift herself off your face for a moment of respite, but like telling you to slow down, that would demonstrate a lack of control that would lead to punishment and probably a greatly extended period of denial.

Instead, your girlfriend tries to communicate with you through little squeals, squeezing your face between her thighs and pinching and pulling on your nipples. Of course, you know exactly what you are doing and have no intention of relenting. You smile inwardly as pre-orgasmic shudders rock her pelvis and press your mouth to her crotch in a final onslaught. You recognize the point of no return and are proud that you can break through her heightened defences.

Diana finally seems to realize you are doing this on purpose and accepts that there is only one way out for her.

"Please may I cum, Mr. Collins? Please, Mr. Collins!"

She has stopped caressing your nipples and is digging her nails into the palms of her hands in an effort to delay her climax, but for a moment you think you may have gone too far and she will reach the peak before your landlord gives his permission, but then you hear his voice.

"Get on all fours and you may cum."

Your girlfriend immediately complies with both instructions, leaning forward and lifting her crotch from your face at the same moment that her orgasm rips through her body. You try to raise your head to continue stimulating her through the aftershocks, but George Collins sharply tells you to lie still.

You have a perfect view of Diana's sex convulsing in the throes of passion, but the noises she is making sound distressed as much as pleasurable. Groans turn to wails and then her head drops with exhaustion.

"Well, we will leave you in Georgina's capable hands," your landlord announces abruptly, as though coming here was nothing more than a minor inconvenience. At least you have managed to avoid getting groped tonight.

This time it is you who is able to speak, thanking Mr. Collins and saying goodbye, while your girlfriend is too out of breath. His daughter sees him and his wife out, then returns and picks your largest (and most powerful) vibrator out of the toy box.

"Alright, girls, keep this pressed between your cunts while you have a good snog."

You manage to suppress the urge to groan at this new instruction. If you assumed the session would end with Diana's climax, you were sorely mistaken. Pressing the mushroom head against your throbbing mound and Diana's oversensitive clitoris, the vigorous vibrations send judders right through your torso. You normally use this particular item on medium, because high is just too intense, but of course the young Miss Collins sets it to maximum.

As your girlfriend tastes herself on your tongue, you feel rather than hear her whimpering, looking at you imploringly, as though you can somehow end this relentless torment.

When Georgina Collins finally leaves, you and Diana are too exhausted to move. She put you through a whole second lovemaking session after the orgasm, which left Diana just as aroused as she was before tonight and you more frustrated than you have ever been. In the silence following her departure, your girlfriend drops just one word.

"Why?"

You pause for a moment, then answer.

"Because I love you."

Then, oblivion awaits.