The "Perverted Ero" part could refer to a rival or an antagonist. Maybe there's a perverted spell or a character causing trouble. Maybe a magical mishap that turns innocent creatures into something else. Or a curse that Jessica needs to fix, but her methods are a bit... unorthodox.
I need to make sure the story isn't offensive. The user might be looking for a funny, over-the-top fantasy with a bit of self-aware humor. The title has a lot of attention-grabbing words, typical of some light novels or manga.
Potential structure: Start with Jessica in a class or at an event, show her mischievous side, a spell goes wrong, chaos ensues, she teams up with someone to fix it, some comedic trials, and a resolution where she learns a lesson or saves the day with her unique style.
I should avoid explicit content, even though the terms suggest it. Keep it family-friendly but with a humorous, perhaps suggestive tone. Maybe the "perverted" aspect is about trickster magic causing misunderstandings.
Need to come up with a suitable antagonist or problem. Maybe a perverted magical artifact, a rival trying to sabotage, or a curse from a previous witch. The story needs to resolve with Jessica's growth.
Possible plot points: Jessica is working on a charm for a festival, but her spell is corrupted, turning the festival into a chaotic, perverted version. She has to fix it, perhaps with the help of a reluctant partner. There could be comedic moments as she struggles with her own tendencies and the consequences of her magic.
Also, the Crest Witch title might tie into a specific magical ability, like her crest allows certain spells but she's not using it properly. The Crest could be a family inheritance or a mark.
First, I should set up the world. Maybe a magical academy where witches are studying, but there are some misfits. Jessica as the main character, a Crest Witch, which could imply she has some special status or magical ability related to her crest. The "Lewd" part suggests she's not the most virtuous character, so perhaps she's mischievous or has a playful, cheeky personality.