Keep him busy with anal.

Ms. K shows you a private guestroom in her house, which sports a bed, and tells you that when Fields rents you again, this room is where the two of you will be fucking...Specifically, Fields will be fucking you in the ass!

She then shows a secret door leading to a room where she has a set up both a video camera (filming the guestroom through a one-way mirror) and a very strange black symbol painted onto the floor besides it.

"When he comes in, hook your panties to the side and take his cock in your butt, okay?" Ms. K smirks, "You just need to keep Fields distracted for 30 minutes while I work some magic here...When he gets paralysed by the spell, your work is done and I'll take it from there. With Fields captured, we can move onto the next phase of my plan. And I'll have a reward for your loyal service, too."

Fields schedules his next "date" with you the next day. Obediently, you greet him at the house, dressed in sexy whore's clothing, and gently escort him to the guestroom. Mr. Fields lies back down on the bed, his massive dick bulging in his trousers. You blush furiously as you take it out, giddy as you feel the warm power of the world's biggest known erection in your hands.

Once his mammoth shaft is exposed, you climb up on top and prepare to get impaled in the asshole. Fields rips off your underwear and then greases your butt with lube, sending quivers up your spine. When that is done, you slowly but surely lower your ass onto his dickhead...