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.
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. Lewd Crest Witch Jessica and the Perverted Ero-...
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. Also, the Crest Witch title might tie into