The journey home was almost completely devoid of conversation, with neither sister speaking until their journey took them almost all the way back to suburbia. Lisa couldn't help but steal glances at Alison's distended abdomen. She knew what she was seeing was just the latest in a list of impossible things that had happened in less than a day. She knew that all of it, no matter what her thoughts were currently telling her, was wrong.
So why is it I'm not horrified? Screaming and railing at what's happened to me? To Ali?
It was then that Alison broke the silence. "Lise, it's fine," she said, not taking her eyes off the road ahead. "It'll... I'm sure it'll work its way out, y'know... naturally."
Alison had clearly been aware of Lisa's gaze. "Sorry," Lisa replied, averting her eyes and matching her sister's level examination of the way ahead.
More silence followed. Lisa's thoughts, free from the focus of her sister's belly, still hovered around the topic of natural processes. It occurred to her that she had still not needed the bathroom at all. Was this affecting her other internal organs? What if it spread to Alison?
There was no doubt that
something
was happening to Alison, and it stood to reason that it was a result of Lisa's emissions. Her mind drifted back to last night, when her first ejaculation had coated her sister's face and chest completely.
Oh god, if that's what happens when it touches her skin, what will swallowing it do?
Unbidden, Lisa's eyes had wandered back to her sister's body. The seatbelt's positioning showed off every single one of Alison's new curves; the shoulder strap passed between her engorged breasts, nipples still standing to attention, while the waist strap was entirely hidden beneath her cum-swollen abdomen. Even though she had climaxed barely 15 minutes ago, Lisa felt a shiver of arousal in her crotch.
There's no way around it. I can't ignore it or dismiss it as impossible any more.
Lisa saw Alison beginning to blush in her peripheral vision.
I am sexually attracted to my sister.
"You OK?" Alison asked, snapping Lisa out of her stupor.
"Huh? Yes! I mean... yes, all good," she replied, returning her focus to the road.
"We're almost home," Alison stated, her voice betraying no emotion. "Then we can talk about... this," she finished, waving her left hand vaguely as she did so.
That last word seemed to encompass so much. Lisa wondered just how far the conversation was going to go. She felt her chest flutter with adrenaline at the prospect of revealing her feelings. But how could she even be sure they were real? What if Alison shared them? She had no idea what to think - less still what to say - and so passed the rest of the drive without comment.
Before too long, Alison pulled into the driveway of their house. As her sister pulled the handbrake and turned off the ignition, Lisa let her head turn again. Alison seemed to be handling everything so calmly. As she undid her seatbelt, reached for the file and opened the door, shuffling out from behind the steering wheel, the entire front of Alison's torso seemed to jiggle. Not letting herself get distracted, Lisa followed suit and got out of the car. Alison was already half way to the house before Lisa could close her door.
When Lisa entered the house a few moments later, Alison was stood leaning back, elbows resting atop the kitchen counter.
"Do you want to go first, or should I?" she asked, causing Lisa's heart to jump again.
"I, I, uh..." Lisa stammered, her voice unsteady. She pointed at Alison. "You can..."
"OK," Alison replied. It was early afternoon now and the light from the kitchen window was shining through her hair. Lisa's eyes were already glued to her sister, but she still strove to pay attention.
"Let's start with the positives," Alison began, looking off into the middle distance. Her face was still passive. "We've got the file. There's going to be something in there that leads us to an answer."
Lisa noted the presence of the file they'd searched for in the library. It was sat next to Alison on the countertop, complete with the newer slip of paper that could well be the hints she was referring to.
"We also managed to keep your condition hidden," Alison continued, her right hand casually brushing her stomach, "so nobody's any the wiser about what's going on. It's still just between you and me."
"Ali, we need to talk about this..." Lisa opined softly, one hand rubbing the back of the other absentmindedly.
"We are talking about it," Alison replied in the same level tone, still focusing on a spot on the opposite wall.
"You know what I mean," Lisa continued, stepping forward a few inches. "Whatever's happening to me is affecting you, too... and it's affecting me in other ways..."
"That's just the horniness talking, the lust," Alison dismissed with another wave of her hand.
"It's more than that, Ali, and you know it!" came Lisa's plaintive exclamation, louder than she had intended.
Alison tore her gaze away from the wall and looked at Lisa with a mix of fear and shame. "What are you saying, Lise? That I'm getting off on this? That I
enjoy
this?!"
"I'm not..." Lisa trailed off, confused but excited.
Does she?!
"I can't believe we're talking about this when we should be
focusing
on how we
fix
you!" Alison railed, walking in a small circle before returning to the counter.
"Ali, please, we can't just ignore it. If... if we at least acknowledge it, maybe we can control it? Keep strong?"
"You want me to acknowledge it? Fine!" Alison threw up her hands, before crossing them across her chest. "At the library, what you did to me made me cum, alright? I don't know how or why I'm not actively gagging at the thought of it, but I'm..." she trailed off, losing steam.
I made her cum?
The announcement completely threw Lisa, her emotions a potent mix of happiness, shock, desire and shame.
She feels the same way as me!
She risked uttering the words she'd been hiding into the silence. "You're attracted to me," Lisa finished for her. "And I'm attracted to you."
"That's... putting it mildly..." Alison agreed, with a flick of her eyes upwards towards her sister.
Lisa tried to hide the rush of adrenaline she felt at Alison's words, but wasn't sure how well she'd accomplished it.
Oh fuck, we both love this on some level.
She thought about probing further, but she could see how much discomfort it was causing her sister. "OK, so we know that this... whatever... has caused mental changes... in us both. But I thought I was the only one it was affecting physically."
"Yeah, well..." Alison shrugged, then lifted her arms as they were folded across her chest, hefting her increased bosom in the process.