A surprise knock on the door

They heard a knock at the door. Felicia went to answer it.

She opened it to see a short, well dressed young lady of roughly 20. She was wearing a respectable blouse and a modest skirt, and her dark hair was pulled back into a ponytail. She wore thick glasses and was, in short, a nerd. Despite her modest outfit, however, the sisters could tell that she sported a thin, lithe figure.

"Hello. My name is Miriam. It has come to my attention that you have been named as sexual targets by the Delta Kappa Magnum fraternity. What you likely do not know is that DKM has secretly allied themselves with the Delta Kappa Mu (Conveniently also DKM) sorority to secure your fate. I realistically expect that without my assistance all four of you will share your sister's fate within twenty four hours."

"Wait, so that whole thing with the pennant was..." said Lisa.

"Yes. A rather obvious trap. The sorority girls befriend the frat's unsuspecting target and convince them to march directly into the frat, agreeing to fully consent to whatever happens. Insemination generally follows." Miriam said.

Miriam continued "I represent Theta Pi. We are a serious academic sorority, and we despise the behavior of these other groups. We intend to rob them of their prizes by helping you avoid seduction. Further, we aim to take those DKM sorority sluts down a peg. They hate above all else the so called 'nerdy' members of our brother chapter of Theta Pi. We therefore intend, with your help, to arrange for our Theta Pi brothers to sexually violate as many of the DKM sorority girls as possible, while under no circumstances allowing ourselves to be violated by DKM brothers".

In short: Theta Pi is good, DKM is bad. When Theta Pi guys screw DKM girls, we win. When DKM duys screw Theta Pi girls (or you should you choose to join us), we lose. Any questions?