Erika can't hold it any longer

Just as you begin to fabricate a hasty explanation for actions you don't even remember, Erika bursts with laughter and Amanda cracks immediately after, following in your sister's giggle fit. The sudden reaction changes your expression to one similar to Paige's, you and your girlfriend now both staring at the two with puzzled eyes.

As they finally calm down and get a hold of themselves, you slowly speak up, not understanding in the slightest the reason for their behavior. "What the hell was that about?"

"I'm sorry, bro. I couldn't hold it in any longer," she explains with one last breath through her laughter, her character finally returning to normal. She turns to Paige as she starts to explain herself. "The truth is that we don't know who the father is. I did most likely conceive on my 18th, but..." Erika trails off, suddenly seeming frustrated. "Well, there were quite a few of my guy friends at the party who had their way with me."

"That's an understatement!" Amanda exclaims, causing Paige to laugh as Erika shoots a dark look in her friend's direction, causing her to fall silent. "Sorry, sorry," the scantily-clad blonde apologizes.

Erika continues to explain to Paige—obviously you're supposed to know this stuff already, but since Charles dropped you in here without even so much as a review, you're responding to this brand new information in a manner similar to your girlfriend. "I had a paternity test done to see if John is the father and the results were negative. I just thought I'd tease you guys a bit, sorry," Erika says with a slight smile. Through her laughs and teasing, you can easily see that she is somewhat worried about who the father might be.

Paige seems unconcerned with the little prank, smiling brightly with a small giggle. "It's alright, Erika. I was just a little worried that John had never mentioned that he was going to be a dad before asking me out," Paige throws you an accusing look accompanied with a cute little smile. "Pretending you're a virgin just before we met...I should have known both of you would be a pair of pranksters. That must run in the Doe family, huh?"

"Haha, you're exactly right!" Erika begins before you bulldoze over the rest of what she was going to say, feeling that this topic of discussion can't exactly get better. A feeling of relief floods over you as you have somehow come out of this without looking incredibly dense or like an absolute creep. Though it seems the latter wasn't really an issue—Paige was only bothered by the idea that you hadn't told her about a baby. The fact your potential baby was also your sister's didn't seem to phase her at all.

"So how did you get pregnant?" Paige questions, her curiosity getting the better of her. "I mean, government service birth control is prescribed to all D-cup women a month before they turn 18 and everything." Paige, being an expert in the topic with how she recently turned 18, seems very interested.

"To be honest, it was like one of those cases you hear of a girl slipping through cracks of the system," your sister admits with a shrug. "I wasn't quite D-cup at my last visit to the doctor, but my bust has been known to fluctuate around that range whenever I'm ovulating."

Erika squeezed her tits together as if to demonstrate, her heaving bosom jiggling back and forth upon her belly as she released her tits. You couldn't help but stare as dark patches on her tank top appeared as she did so, spread out in perfect circles. As her nipples leaked, they became visible through her shirt, furthering your erection—you had become hard throughout the discussion, and embarrassingly enough, the thought of impregnating your own sister was turning you on fiercely. You need to release and your sister's body is making it to hard to concentrate.