Yes. Doing some careful research.

Eve's head was pounding. She felt a migraine coming. Her entire life she had learnt how to handle bad cases of headaches. But this time was different. The lack of sleep, and stress from the fight she just had with Miriam had clearly taken its toll. The entire busride home she massaged her temples with closed eyes. Trying her best to think of anything but what had just happened. It was however impossible to not obsess over what had happened. It was as if someone had replaced Miriam with a version from the mind of some hormonally challenged teenager. It simply didn't make sense. Opening the door to the apartment at least gave her some respite as it seemed none of her flatmates from the sorority were home, or at least not in the shared living space. Most of them did have afternoon classes and cheer practice after all.

Entering her room she wanted nothing more than to simply go to bed and sleep the migraine away, but she couldn't get these thoughts out of her head. Instead she popped an aspirin and swallowed it with a mouthful of water. Setting down her laptop on her desk she plugged the charger into the socket in the wall, opening the laptop and logging in.

- Okay...time to figure out what the fuck is going on...

In her mind something had happened in that bathroom when Miriam left. Eve was not sure what. But it felt strangely connected to whatever Mark showed her friend on his phone. Thus she began to search the web for strange reports of women growing larger. At first she mostly just got various fetish art and pornographic images pop up. She had no idea people were actually into this kind of stuff. Luckily Eve was an expert at narrowing down searches thanks to often needing hyper specific references for her drawings. With some tweaking she manages to find some direction, clicking on a day old forum post from some site she had never heard of before. The original poster goes on to write about a strange phenomenon where they noticed their friend having grown larger tits over night, and also seemingly becoming obsessed with using their new breasts in sexual ways. That sort of sounded like what might have happened to Miriam. Scrolling down to the comments in the thread she starts to notice people mentioning that they had experienced something similar and that their 'changed' friend had mentioned watching some sort of music video on youtube. Scrolling further, there were comments disagreeing. Several were calling this a silly hoax, others were saying the video is just funny and not harmful, others were simply sending a bunch of hyperlinks. Trying to get people to click. Eve hovered over one such link, how dangerous could it really be? She refreshed the page, finding that the thread had been edited. The title now read.

"Sorry. Was just trolling. Of course something like this can't happen. Here's a funny video to make up for me teasing you~"

By now Eve recognized the URL to youtube, remembering the days of trying not to get rickrolled. This time it was different however. Not just a simple meme to send between friends.

Eve swallowed. That was it, wasn't it. Fighting through the throbbing of her migraine she felt herself begin to connect the dots as she considered her day. First Fia had asked her to watch something with her...which Eve had declined. Then there was the two girls on the bus that had annoyed her as well. And finally Miriam. Whatever this was, it was dangerous, and seemed to spread between people. Eve thinks back to the groupchat. She might very well still be herself thanks to choosing to ignore it. What if all those messages earlier were her fellow sorority sisters sharing this video. If everyone in her apartment was compromised...that meant that she needed to get out of her-...

A loud knock filled Eve's bedroom. Fia's voice speaking through it.

- Hey Eve! You there? Can I come in?
Shit...what to do? Panic!
- G-gimme a second! I'm changing.
- Okay...not like I haven't seen you nude before...just don't be long. I still want to share something with you!
I bet you do you zombified bimbo, Eve thought to herself. Was there anything left of the Fia she knew at this point, or had whatever this thing was already completely hijacked the swedish exchange students brain?

Scrambling to figure out what to do Eve grabs a couple of bra padders she had been gifted by the sorority on her birthday. The girls had clearly felt sorry for her flat chest and felt that she needed a bit of a boost, something she felt was frankly insulting. But she had chosen to ignore that feeling thinking that her flatmates were simply doing what they thought was a kind gesture. Little did they know they were about to get some use. Stuffing her bra with the padders Eve quickly propped herself up to produce as much cleavage as possible.

- You alright Eve? You're taking awfully long~
- Yeah I'm fine! Just gimme another sec.

Hastily Eve threw on a different top, needing to make it look as if she had changed her outfit from this morning. Luckily she had a low-cut cardigan that helped expose her now improved cleavage. With one last deep breath, she walked up held her ear up to the door, listening for any noise from the other side. What if Fia was ready with the video? She didn't hear anything though as she carefully opened the door, hoping that her swedish friend was not about to turn her brain into boobs.

- Hey! I just wanted to-....oh! you're looking good Eve. Did you watch the video on your own?
On the other side was Fia. She was holding her phone lazily at her side, smiling warmly as she looked at Eve.
- Uhh-y-yes! Saw it on the bus home actually. Two girls who could give you a run for your money in terms of bimbo looks showed it to me.
- Yay! I'm so happy for you~ I was worried that you wouldn't read the groupchat like you usually do and miss out on such a fun video!
- Yeah...well thanks for worrying. But I'm good now.
Eve saw how Fia's eyes were studying her form, very obviously looking straight at her chest.
- Hmm...you have kinda small tits though. How are you gonna be a titslut with those?

- W-well uhm...

- Are you sure you watched the entire thing?
- Yes! I Love being a titslut! I couldn't stop thinking about using my breasts on this cute guy on the bus.

She had to sound convincing. Surely she sounded excited enough. It was a difficult task to pretend to be some vapid bimbo when her migraine was constantly thumping in her head.
- Nice! Please tell me you did!
- No...this boring busdriver wouldn't let me. I undressed and got kicked off. The dude didn't want to follow when I had to walk home...its why I had to change clothes because I had to walk home in the rain.

It hadn't rained today. Why did she say that? Perhaps Fia wouldn't pick up on such a stupid inconsistency in her story.
- Wow! Laaaame....well do you want to like come to this party tonight? You haaave to come! The gals invited like all of these dudes and a bunch of girls too! We're gonna introduce them all to the video as a surprise. Can't get enough joy from spreading such a fun and bouncy thing, right?
- T-totally! But ahhh....I'm kinda double booked. You know i'm not a party girl and i'd love to...uhm...titfuck some guy at the party, but I was kind of thinking of spending some time sending the video to a bunch of people online. Maybe some people on that art site I occasionally post my work too.
- Ooooh...okay. I get ya. Good titsluts do spread the video. And I suppose you can do so through different means. You sure though? You won't find any hot dudes to let cum over your tits on the laptop!
- Y-yeah....i'm sure. And don't say that. I've uhhh...hooked up with people online before. Remember Victor?

Eve noticed the cogwheels turning in Fia's head. Her swedish friend seemed to think for quite a while until the lightbulb was finally lit in her bimbo brain.
- Oh yeahh!! That guy was really cute. Wouldn't mind him joining the party and having some fun too~ Like imagine his fingers rubbing over your tits, caressing your nips. Would be hot, no?
- Y-yeah. Totally. But uhm...I think I should get to it. Got posts to make, dudes online to meet, you know?
Fia nodded, understandingly.
- Totez. I got it. Don't wanna get in the way of a fellow titslut making their titties worth~
Fia giggled with a smile. Eve tried her best to fake a giggle back. She wasn't sure if this had fully worked yet. But somehow Fia gave her a wave and closed the door. Eve was safe, for now.