One possible plot could be that Hermione discovers an old, forgotten potion recipe for a baby breastfeeding potion while researching in the library. Snape, being the Potions master, is skeptical at first but then realizes the potential of this potion. They might have to work together to perfect it for a baby in need, perhaps an orphaned magical baby. Along the way, they develop an unexpected bond as they care for the baby.
I'm not sure if there is a specific fanfic precisely on this combination. There are a vast number of fanfics in the Harry Potter fandom, and while there could be one out there that involves Snape, Hermione, and a potion related to a baby in some way, it would take some extensive searching through fanfic platforms to find it.
The plot could revolve around Hermione being embarrassed about her period cramps in front of Snape. However, Snape, having known Lily Potter (Hermione might remind him of her in some ways), decides to be kind. He could share with her some of the old remedies that were used in the wizarding world for such ailments. As they interact more, Hermione begins to see Snape in a different light, and Snape starts to soften his attitude towards Hermione. This could lead to a series of events where they bond over this rather personal situation.
Perhaps in this fanfiction, the wizarding world is facing a new threat that requires all houses to come together. Hermione and Draco are chosen for a special mission, and during this time, Draco's baby is left in Hermione's care. She breastfeeds the baby as it's the most natural way to nourish it. As she does so, she discovers new things about Draco's past and family that make her see him in a different light, and this changes the whole dynamic between them.
Well, one possible plot could be that Hermione discovers a long - hidden side of Snape. Maybe she stumbles upon some of his old research or personal writings that show a different Snape than the one she knew at Hogwarts. This could lead to her having a newfound respect for him and they start to work together on some magical project, gradually forming an unlikely friendship.
Well, in this fanfiction, it might start with Snape finding Hermione as a baby in a dangerous place like the Forbidden Forest. He adopts her because he sees her potential even as a baby. As she grows, he teaches her magic in his own strict way, but also forms a deep bond with her. This could lead to some interesting interactions with other Hogwarts faculty who are surprised by Snape's new role as a father figure.
One possible plot could be that in an alternate universe, Dolohov has a change of heart. He somehow crosses paths with Hermione, and they gradually develop an unexpected bond. Eventually, they have a child, and the story could revolve around how they protect their family from the prejudices of both their former worlds.
In a Hermione potion accident fanfic, she might accidentally create a potion that causes strange transformations. For example, she could turn into an animal or have her appearance altered in a unique way. This could lead to all sorts of adventures as she tries to reverse the effects. Her friends, like Harry and Ron, would likely be involved in helping her figure out what went wrong and how to fix it.
The plot could start with Hermione accidentally stumbling upon a time - travel device or spell. She ends up in the past where she meets Lily and Snape. She quickly realizes that she can't just mess with the past without consequences. So, she tries to subtly influence them. For Snape, she might try to nudge him towards a path where his love for Lily doesn't turn into bitterness. For Lily, she could be a confidante, sharing secrets from the future about the wizarding world's future challenges.
One possible plot could be that Hermione discovers some dark secret that Snape is involved in, and she uses her intelligence and magic skills to capture him in order to expose the truth. Maybe she stumbles upon a plot by Snape that endangers Hogwarts, so she takes it upon herself to stop him.
Well, perhaps in the fanfiction, a villain uses a love potion on Harry to make him fall for Snape in order to create chaos in Hogwarts. Snape then has to deal with Harry's sudden affection while also trying to uncover the plot behind it. They might go through a journey of self - discovery and realizing that there are deeper emotions hidden beneath the false ones caused by the potion.