All her friends save herself had been exposed to the vial, and it seemed to have triggered some sort of accelerated puberty and put her friends into a canine-like heat... On top of that, Melissa was actually pregnant now.
Emily looked the most flustered and was looking sheepishly at Erika through her auburn bangs. Perky breasts were poking under her buttoned shirt in place of the flat chest she used to have, and her hips had widened a bit, making her school skirt look shorter. She was squirming on her feet, tugging on her clothes to hide her curves, without much success.
Melissa's also looked older and womanly - she was a precocious girl already, and her slight chub added to her ample curves, but now her bosom stretched her school uniform awkwardly. She had put on her school sweater over her shirt to minimize the effect, but Erika could tell.
Scanning her crush and best friend's body, she saw that Melissa's chub was protruding under her sweatshirt. And it was all Erika's fault... The memory of her canine member bursting with seed inside Melissa came back to her, and she felt her clitoris tingle. Fortunately Melissa thought Erika as innocent in all this, believing it was her friend's dog that had impregnated her... Erika's cheeks felt hot; she couldn't deny she felt a little jealous and possessive, but she could not tell her friend the truth!
"Are you okay?" Melissa asked as she walked to Erika and hugged her, their large chests squeezed together. Below, Erika could feel Melissa's belly - it was rounder and firmer. Her scent also smelled different somehow - good, but not intoxicating like it used to be.
She nodded and gave a quick hug to Emily as well, almost letting out a gasp and she felt two hard nipples brushing against her own. Her canine senses kicked in as she caught a whiff of Emily's scent - Emily smelled like she was entering heat. Erika's insides clenched, and she felt blood rush in her clitoris, which started swelling in her wet panties.
The two friends broke their embrace as their maths teacher came in the classroom, and everybody went to their seat.
Erika had trouble focusing on the teacher's boring ramblings. She couldn't get rid of the intrusive thoughts provoked by Emily's persistent scent, which only Erika was aware of. She could smell her sex from where she was sitting; meantime, Emily kept squirming on her chair, visibly frustrated as well. Whenever Erika tried to look away, her eyes would fall upon Melissa's huge breasts.
At end of the class, Melissa let out a muffled yelp - and Erika saw her friend's belly visibly push against her sweater a little bit, lifting it an inch higher. Some heards turned to Melissa, who looked unwell, and she froze. Fortunately the bell rang just in time, and everybody left the class and scattered in the corridors in a matter of minutes while Melissa was slowly packing her stuff. The three friends stopped outside the classroom.
"Are you okay?" Emily asked naively.
"I'm fine!" Melissa snapped. "Just a bit nauseous from a stomach bug, that's all". She averted her eyes from Erika, embarassed.
"Well... we should go now if we don't want to be late for physical ed..." Emily added.
Erika gasped audibly. She had totally forgotten about PE, and she hadn't taken her gym uniform with her today.
"Did you forget your clothes at home Erika?" Melissa asked.
"Ah... I... yes, I forgot..." Erika stuttered.
"You can use my uniform if it fits, I'd really like an excuse to avoid PE today; I feel like I could throw up" she added, and Erika knew that was probably true. She nodded - she already pulled an excuse just last week to leave early and didn't want to get in any trouble this time - and so Melissa pulled her gym clothes out of her bag.
As the three friends walked to their next class, Erika's swelling clitoris was rubbing more and more against the fabric of her panties, leaving her flushed and frustrated.