Write what you know girl....
Oral Fixation
Size Queen
Cocky and Smart Woman who really just wants to be submissive slut
I see you writing something about taking an older married man, seducing and corrupting him.
Perhaps... working somewhere with a lot of men, you discretly service only the most well endowed of the office, following a guy into a back room, pulling his pants off, measuring his cock, sucking his cock then seeing how much you can turn him on then you measure him again... after a few minutes... making it a competition or a challenge to see how big you can get him to grow... finding the biggest guy in the office... I dunno
Really... I think you will have the most success if you draw from one of your personal memories, and then act it out as a fantasy, like if you would have really pushed the envelope that day, what would you have done...