Ask for an explanation

For probably the only time in your life, you interrupt a girl who is in the process of giving you a blowjob.

"Wait just a fucking minute!" you say, trying to get your head around the situation. "Are you telling me that the two of you have been in on this all along?"

Sarah and Kendra look at each other and laugh. "I told you he didn't have a clue," said Kendra.

"Oh, but no one can really be that clueless!" replied Sarah, momentarily distracted from giving you a blowjob, but still unable to keep her hands off of your cock. "I mean, really, Connor! Did you honestly think we could do all that nonstop fucking without Kendra being aware of it?"

You look at your girlfriend, still unable to grasp the truth. "And you're not pissed at me?"

She grins. "I admit I was at first... Before I really got to like you. I just thought you were a typical college boy, and you couldn't pass up a willing piece of ass. But then as I got to know you and like you, I could tell you actually were concerned for me and for Sarah. I got over being pissed, and I actually find it all rather sweet."

"So.... What does this mean?" you ask.

"He really is slow today, isn't he?" Sarah lowers you onto your back and re-positions her head between your legs as Kendra straddles your face, lowering her pussy onto your mouth. "It means, sweetie, that we are going to have a LOT of fun!"