She lies.

Susan had never taken anything for birth control in her life, and of all the weeks for this fetish of hers to have a flare up it would be the one week of the month she is ovulating. So Susan lied.

"Today is a safe day, and I have taken my pills religiously since I got them." She blushed a bit at her lie, but it could be hidden in the sudden idea that in a few moments her and Troy could be fucking. She suddenly got worried that the other girls would be jealous, "Are you guys OK if I decide to take Troy for a test ride? You won't be jealous, right?"

For the briefest of moments she thought the three women were going to protest. But they all seemed to calm down and go back to rubbing their big, gravid bellies, "We are completely fine if you try out our Troy here...remember though, you'll fall in love with him!"

Susan scoffed at that, with Troy asking, "Are you immune to any of my charms?" Suddenly Susan wasn't so sure if she was ready to take this leap...except those worries were erased because falling in love with Troy was a consequnce of getting knocked up. She became excited again, but then looked at the three women who were already a part of Troy's breeding harem, "Ugh...but you three are so pretty and I'm just a dumpy, ugly girl with an insane fetish."

Troy was hearing nothing of it, and neither did his girls. Caroline spoke up with a reassuring smile, "Girl you are the most stunning woman on campus! Your breasts are better than mine," the twins spoke up, "And you're far more breedable than any of us." Susan sighed and broke the world with a question, a single word with an upticked intonation at the end, "Really?"