Chapter Text
Mystia Lorelei was many things. A punk rock performer, a lamprey stand owner… actually maybe that was about it, but for the standards of Gensokyo, that was a lot! On this day like any other, Mystia headed to her favorite little river, one just on the outskirts of the Bamboo Forest of the Lost.
She rolled up her sleeves and stepped into the water, running her hands all along the bank. Recently, Mystia had cut her nails to be more in line with those of normal humans. Her mind was blank as she caught a few lamprey and put them in her bucket, when suddenly…
Mystia: “Ah!”
Mysita let out a small cry as she felt a sharp pain from one of her hands. Lamprey generally didn’t bite, but it wasn’t so uncommon that Mystia was overly surprised. What did surprise Mystia was the lamprey itself. When she took her hand out of the water to pry the lamprey off her hand, she was somewhat stunned by it. Most lamprey are thin, small, and grey, at least the ones Mystia usually saw. This lamprey was none of those things. It was thick, at least four times as much as a normal lamprey, and the length matched. It was also an extremely bright but saturated pink, looking completely unnatural on a living creature. Mystia stared at it as it sucked on the back of her hand. The pain was there, but it was small. She didn’t feel a need to pull it off immediately. It was kinda pretty, as weird as it looked.
Mystia felt a headache coming on but she just couldn’t bring herself to pull it off. Mystia started to breathe heavily. It felt… good? She felt good? As she watched the lamprey she got more and more confused by both the look and existence of the creature and her reaction to it. Eventually, apparently satisfied, the lamprey stopped sucking and fell back into the water, and Mysita lost track of it almost immediately. Feeling lightheaded, she waded back over to the shore.
Mystia: “Ugh… I don’t think I’ll open the stand today…”
She looked down at her hand and examined the wound. It was shallow and was just barely bleeding.
Mystia: “Guess I should wrap it up.”
Mystia headed home, and spent the rest of the day doing nothing in particular.
The next day, Mystia woke up feeling strange immediately. She looked down at her hand, which was still lightly bandaged, and took it off. There was a bit of a scab or bruise but she thought it was probably fine. As she looked at her hand, her gaze wandered to her fingers.
Mystia: “Huh… that’s weird. Didn’t I cut my nails short?”
Mystia’s nails had indeed grown quite a bit since yesterday, still not as long as she had had them before, but clearly longer than they should be after only a single day. She looked at her other hand and it was the same. This was weird, there was no mistaking it, but she didn’t know what exactly to think of it or do about it. Mystia got up and got dressed in her usual clothes. They were a bit tighter than usual, but she didn’t notice. Kyouko was coming over to her house today to help write lyrics for their next song, as they had agreed a few days ago. Mystia went about her normal daily routine, including making herself breakfast. As she ate, she couldn’t help but want to eat more than usual, but she refrained.
After all, Kyouko was going to be here soon!
Kyouko: “Misty!”
Kyouko’s always loud voice boomed from outside, and Mystia bolted up to open the door before she knocked it down from pure volume. As Mystia opened the door and looked at Kyouko, she was overwhelmed by feelings she had never felt before. Why was Kyouko… soooooo cuuuute!? Mystia had never been particularly attracted to her friend before, or anyone really, but for some reason, looking at her now, Kyouko looked completely different to Mystia then she ever had before even though she was actually unchanged. Kyouko’s shaggy green hair, her floppy ears, her large eyes, they were all ADORABLE to Mystia. Mystia could feel her mouth start to water and she quickly put a hand to her face.
Mystia: “Uh, come inside!”
Kyouko walked inside and sat at the table. As she walked past, Mystia looked at Kyouko’s short little tail and her mouth continued to water. Though the feelings that filled Mystia were mostly those of adoration, there were also unmistakably those of predation. As a bird Youkai, that wasn’t something she was completely unfamiliar with, but it was rather rare. She wanted to eat Kyouko up, she really did. Mysta shook her head and tried to act normal, closing the door and sitting at the table across from Kyouko.
Kyouko: “Are you okay Misty? Your face is red.”
Mystia: “Y-Yeah, I’m totally fine!”
Kyouko reached across the table and put her hand on Mystia’s forehead. Even at this gentle touch made only out of concern, Mystia couldn’t stop herself from rubbing her thighs together lightly.
Kyouko: “Hey, you totally have a fever! Why are you trying to act like you don’t?”
Mystia started to breathe heavily.
Mystia: “I-I uhh really want to write the song with you. My… uh best friend! Yeah!”
Kyouko: “Really? You just want to write the song? Well, I’m not gonna let you! Go lay down and get better from this fever first Misty!”
Kyouko walked around the table and started to drag Mysita towards her bed.
Mystia: “W-Wait! Stop!”
Kyouko: “No can do Misty, you’re gonna rest.”
Kyouko’s sudden rough handling was not helping Mystia’s condition at all, and she suddenly felt something in her snap slightly. Without even thinking or telling her body to do anything, Mystia slammed into Kyouko who then fell on her back onto Mystia’s bed.
Kyouko: “Ow! What the hell was that for?”
Kyouko looked up at Mystia with confusion and concern. Her eyes meet Mystia’s. “Oh.” Kyouko thought. That’s not normal. That’s very not normal. She had a distinct look about her eyes and overall body language that signaled to Kyouko's latent animal instincts that this was a predator looking directly at prey. Kyouko shuddered. This predatory Mystia wasted no time pouncing on Kyouko. Kyouko closed her eyes out of fear, but rather than pain like she had been expecting she just felt… weird? She slowly opened her eyes to see Mystia’s face right in front of hers, kissing her forcefully.
Kyouko: “Misty!”
Kyouko tried to push her off but Mystia wasn’t having any of it and she kept slamming her lips into Kyouko’s. As Kyouko started to get light headed, Mystia leaned off her just a bit and breathed heavily directly onto Kyouko’s face. A slight bit of sanity returned to her eyes.
Mystia: “Kyouko… hah… hah… I’m sorry.”
Kyouko: “Misty… what… was that?”
Mystia: “I-I don’t know! You just looked so… desirable. Like I had to have you.”
Without thinking, Mystia leaned down to kiss Kyouko again. Though the sanity had returned to her, it was clear she still couldn’t control herself. The kisses this time were more normal and gentle, and though Kyouko was still confused, her resistance was weak.
Mystia: “Kyoukooo, you’re so cuuuute.”
Mystia’s voice was both needy and greedy as it spilled out of her mouth, and Kyouko found it within her to push her off again, Mystia landing on her butt.
Kyouko: “I’m going to go tell Miss Yagokoro! You clearly need help!”
Kyouko bolted to the door and started flying in the direction of Eientei as soon as she got outside.
Mystia didn’t give chase, and instead got up and sat down on her bed. She quickly pulled her panties down and stuck her fingers into her sopping wet pussy, the nails that had grown even longer since earlier immediately scraping against her walls.
Mysita: “What has come over me!? Dammit!!”
Mystia moaned in both pleasure and frustration as she masturbated. She took off her dress and underwear to pinch her slightly larger nipples on her slightly larger chest. She came within minutes, gritting her teeth as she did so. She leaned against the wall on her bed, panting and lightly drooling. Mystia’s breasts subtly expanded, faster than they had been doing before but still not enough for Mystia to truly notice as she sat exhausted and deep in thought.
Since that morning, Mystia’s breasts had gone from a 78 cm measurement to 89. Her waist had also subtly gotten thinner, from 59 cm wide to 57. Her hips had widened, from 82 cm to 87. Mystia was still no insane bombshell, but any stranger looking at her would likely have an ever so slightly different impression.
As Mystia leaned back against the wall she felt something slightly off.
Mystia: “Huh?”
As she held it in her hands, Mystia could clearly tell her hair had grown a bit, now comfortably past her shoulders.
Mystia: “What the hell is going on? First my fingernails, then how I acted before and now this?! What is happening to me?!”