Wendy Adams was a single 27 years old nerd who spent the majority of her time alone in her room playing games on her computer and eating fries, she was never popular with guys thanks to her non attractive and chubby body. Only having to see the sunlight when going to work, waiting for it to end and go to her personal and boring cave again.
One of her weekends she was doing the usual, browsing some stuff to buy on the internet but then she accidentally clicked on a weird monster ad which directed her to a strange site called "mutate-me.com", she was about to close it but read a little and began to get her interest.
The tab claimed to be a site where people could actually transform into monsters at their will, with an immense possibility of forms and powers, Wendy loved monsters, actually kinda aroused her, reading many fanfics related to monster transformations and even writing her own stories, since she hated sometimes how monster stories lacked details or interesting things.
Wendy was surprised with how in-depth it went, although it lacked a physical representation of the monstrous forms or modifications. For example, it described how many fingers a SINGLE limb could have, if the fingers had smell sensors, and even if a touch from the fingers were poisonous. Heck, if the poison was lethal, painful, and/or an aphrodisiac. The site could even give advice for flavor as it seemed to pay attention to what Wendy looked at or lingered on.
She thought about it and even if she was doubting at first she got excited as she read, maybe her stories could come true, so she began to write what her transformation woulf be and what powers and conditions it had, setting the duration to all the day to test if everything she saw was real.