Well, the theme of temptation is also there. Pennywise is known for luring his victims, and in fanfics, he tries to tempt the reader in various ways. And of course, the theme of the supernatural is prevalent, as Pennywise is a supernatural being and fanfics often expand on the strange and otherworldly aspects of his existence.
Fear is a very common theme. Since Pennywise is a terrifying character, fanfics often play on the reader's fear of him. Another common theme is the unknown. His otherworldly nature and the mystery surrounding him are often explored.
The theme of transformation is also possible. The pregnancy is a form of transformation for the reader, and Pennywise itself is a being that can transform. So, the fanfic might play with how these two forms of transformation interact. There could also be a theme of love in an unexpected context. Despite Pennywise's nature, the fanfic could explore a form of love or at least a strong connection between Pennywise and the pregnant reader, which is quite different from the normal perception of Pennywise.
Well, some 'pennywise x pennywise fanfic' might focus on the concept of duality. Pennywise has different aspects to his character, and fanfics could explore how these aspects interact with each other. There could also be themes related to chaos and order. Pennywise is associated with chaos, and when two of them are involved, the fanfic could show how they either create more chaos or try to establish some sort of order within their relationship. Additionally, themes of transformation might be present as they could potentially change each other in some way.
One common theme is the allure of the unknown. Pennywise is such an otherworldly character, and in fanfiction, the reader is often drawn into his strange and mysterious world. Another theme is the battle between fear and attraction. The reader may be terrified of Pennywise but also strangely attracted to him.
One common theme is the exploration of fear from a female perspective. Female characters often face Pennywise in different ways compared to male characters in fanfic. Another theme is the idea of female empowerment. They might be shown as strong enough to resist Pennywise's power or even turn the tables on him.
Common themes in Pennywise x Child Reader fanfiction include the power struggle. Pennywise has a lot of power, and the child is in a vulnerable position. So, the story often revolves around how the child copes with this power imbalance. Additionally, themes of mystery are present. The nature of Pennywise and his actions are often mysterious, and the child is trying to figure it all out. And of course, there's the theme of survival, which is crucial as the child is constantly in danger from Pennywise.
One common theme is fear. Since Pennywise is a terrifying character, the male reader often has to face his fears. Another theme is the struggle between good and evil. The male reader usually represents the 'good' while Pennywise is the 'evil'.
Since I can't promote or discuss inappropriate 'lemon' content directly, for general 'pennywise x reader' fanfiction, common themes include the fear factor. Pennywise is a scary character, so the dynamic between his terrifying nature and the reader's reaction to it is often explored. Another theme is the idea of an otherworldly encounter.
It's hard to say there are common themes as it's such a rare and specific type of fanfic. But perhaps one theme could be the exploration of the abnormal or the grotesque, given Pennywise's nature as a terrifying entity. Another might be the idea of something unexpected and 'against nature' happening, as Pennywise getting pregnant goes against the normal understanding of the character.
One common theme is the unexpected encounter. Since Pennywise is a menacing and often unpredictable character, the fanfictions usually start with a sudden meeting between the male reader and female Pennywise. It could be in a spooky setting like the sewers or an abandoned house.
One idea could be a story where an old reader of Pennywise stories discovers a new fanfic that reimagines Pennywise in a modern, more complex way. For example, the new fanfic might explore Pennywise's origins in a different dimension or with a different set of motives. Another idea could be a crossover in the fanfic where the old Pennywise from the original stories meets the new interpretation, leading to a clash or an unexpected alliance.