In a non - offensive and family - friendly fanfic idea, perhaps Petunia Dursley discovers a magical cock cage (not in a vulgar way) that has some connection to the wizarding world. Maybe it was left by a wizard who visited Privet Drive by mistake. Petunia, being the nosy character she is, tries to figure out what it is and how it works. This could lead to a series of comical events as she fumbles with this strange magical object, all while still maintaining her strict, Muggle - like personality.
One idea could be that the cock cage is actually a misidentified object. It could be a magical containment device for small, pesky magical creatures that Petunia mistakes for a cock cage. When she accidentally activates it, these tiny magical creatures start causing chaos in the Dursley household. Harry, being used to magical oddities, tries to help Petunia deal with the situation, which could be a start of a very different relationship between them in the fanfic.
In a more comical plot, the lemon could be a mischievous magical object that keeps causing chaos in Petunia's house. It might make things float or turn into strange creatures. Petunia, being the uptight person she is, has to deal with this lemon - induced mayhem while also trying to keep up appearances in front of the neighbors. This could lead to some really funny situations and a change in her attitude towards the strange and magical over time.
In the fanfic, the cock cage could make Petunia feel a sense of responsibility. Maybe she realizes that she has to keep it away from Dudley or Vernon, and in doing so, she starts to show a more protective side. This could lead to her developing a new understanding of Harry, who has always been in a world full of strange and potentially dangerous things. She might start to see him as a person who has had to deal with a lot, just like she has to deal with this strange object now.
One way could be to explore her relationship with Lily before the events of the main series. You could write about their childhood, how their differences started to emerge, and how Petunia felt about Lily's magical abilities at that time.
By focusing on their shared past traumas. For example, both have had experiences related to Lily's death in different ways. Harry lost his mother, and Petunia lost her sister. They could start to bond over this common pain and gradually move towards a more positive relationship.
A fanfic could connect them by having a toy that was passed down from Lily Potter to Harry, but Petunia has kept it hidden all these years. When Harry discovers it, it causes a big conflict as Petunia doesn't want to let go of the last piece of her sister she has in that way. But eventually, it could lead to a moment of reconciliation between them.
One possible fanfic could be about Petunia Dursley finding a magical toy that once belonged to Harry Potter's parents. Maybe she discovers it in the attic and it starts to show her memories of Lily and James Potter. She realizes that she has been wrong about Harry all along and decides to change her attitude towards him.
A possible plot could be a time - travel scenario where Harry and Petunia are sent back in time. They have to rely on each other to survive in the past, and in the process, they learn more about their family history and each other. This shared adventure could lead to a deeper understanding and a different kind of relationship between them.
Petunia Dursley is significant as she represents the non - magical world's reaction to magic in the Harry Potter series. She is a Muggle who has a complex relationship with the magical world. She has seen magic through her sister but resents it. Her actions towards Harry, like treating him as an outcast in her home, show how some Muggles might fear or be envious of the magical abilities they don't possess.
One reason could be jealousy. Maybe she's jealous of the magical world that her sister Lily was a part of. She might feel left out or inferior, which could lead to her anger.
One good aspect is the exploration of their family ties. Petunia is Harry's aunt, and despite her coldness, there could be a deeper connection beneath the surface. Another aspect is how Petunia's Muggle perspective clashes with Harry's magical world.