The praying mantis (Patreon)

Using a love potion on your crush to make her like you isn't nice. But not following the instructions while making the potion is just plain stupid. And Kevin is about to learn it the hard way.

Warning : this story goes full body horror and gets a little gross. If you're not into that, it may not be for you. Also, (sorry about the spoiler), the person responsible for the transformation becomes the monster's next meal. If you're not okay with characters not surviving, it may be upsetting too.