There might be some fanfics with a similar concept but made appropriate for general audiences. Some fanfic authors may take the idea and twist it into a more platonic or magical - misadventure - type story that doesn't involve any inappropriate or adult - themed elements. However, it can be quite difficult to find as the original idea is rather out - of - the - box and often explored in more mature fanfic areas.
In fanfic, the concept of ethics can be quite complex. From a general moral standpoint, getting a girl pregnant at a young age as might be the case in a 'Harry gets girls pregnant fanfic' is often considered unethical in real - world values. However, in the realm of fanfic, it's a fictional exploration. Some might argue that it's a way to explore different storylines and character developments, but it still might make some readers uncomfortable given the serious nature of the topic.
It's difficult to say whether there is a 'harry gets pregnant by bill fanfic'. The world of fanfiction is so large and diverse that almost any concept can be explored. But considering the nature of the Harry Potter series, which is mainly focused on magic, adventure, and the fight against evil, this type of plotline seems rather uncharacteristic. Also, the Harry Potter fandom has certain unspoken norms and expectations, and this might not fit well within those. However, with the freedom that fanfic authors have, it's not entirely impossible that such a fic exists.
There could potentially be a 'harry gets pregnant by bull' fanfic out there in the vast world of fanfiction. However, it's not something that would be considered mainstream or in line with typical fanfic themes. It might exist in some more niche or experimental corners of the fanfic community, but I haven't come across it myself.
One possible plot twist could be that it was all a dream or a vision caused by a powerful magical artifact. Harry wakes up thinking it's real, and then he has to figure out what the vision means. Maybe it's a warning about some future danger related to Severus, and the pregnancy is just a symbolic representation of something they need to protect or create together in the future.
There might be some out there. Fanfiction writers can come up with all sorts of creative and sometimes out - of - the - ordinary ideas. However, this one seems quite unique and might not be as widespread as more common fanfiction themes in the Harry Potter universe. Some smaller, more niche fanfiction communities might be a place to look, but again, it's hard to say for sure.
This kind of fanfic involves very abnormal and often not - acceptable scenarios. In the world of fanfiction, there are a lot of works that range from the creative to the downright strange. But this concept is so far - fetched that it's likely not a common or well - known fanfic. It also might violate some basic norms and ethics within the fanfic community.
I'm not aware of any such fanfic. Fanfiction often contains a wide variety of strange and inappropriate concepts, but this one seems rather extreme and goes against the nature of the original Harry Potter story in terms of the characters' relationships.
A possible plotline could be centered around Severus seeking help from unexpected sources. Maybe he turns to some of the more neutral or even good - aligned wizards and witches for advice or assistance, since he can't rely on Voldemort or the Death Eaters completely. The pregnancy could also be a catalyst for Severus to re - evaluate his life and his actions. He might start to question his past decisions and try to find a way to create a better future for himself and the unborn child, all while dealing with the stigma and danger associated with such a situation in the wizarding world which is full of secrets and power struggles.
The plot might involve them trying to keep it a secret at first. Harry would be worried about how it would impact his fight against Voldemort. Tonks, on the other hand, might be excited but also scared. They'd have to figure out how to balance their relationship, the coming baby, and their duties in the wizarding world.