Maybe it's for convenience. If the mom is in a hurry and needs to keep an eye on the child while getting clean herself.
One reason could be to save water. Showering together can be a way to use water more efficiently. Also, it could be a form of bonding. The mom might feel it's a special time to be close to her child and wash them at the same time.
One possible reason could be that she is interested in home improvement. Maybe she wants to get ideas for remodeling the bathroom, like new shower fixtures or a better shower design. So, these stories can provide her with inspiration and knowledge about the latest trends in showers.
One possible meaning could be that it shows the mom's nurturing side. She is taking care of her child's basic needs like cleanliness by showering with the child.
I'm not sure specifically what the'mom showers with me' story is. It could be a very personal family story about a mother and child sharing a shower experience perhaps for convenience when the child was young, like for example, when the child was too small to shower alone and the mom had to be there to help keep the child safe and clean.
Perhaps she was influenced by her own upbringing. If she had a great relationship with her mother when she was a little girl, she might be trying to replicate that with you. She could also be doing it as a form of protection. By making you into a 'baby girl', she might feel like she can shield you from the harshness of the outside world in a more motherly way.
Another reason might be related to cultural traditions that are not in line with modern values. In some old - fashioned cultures, there are concepts of chastity that are enforced in a very strict way, and a mother might be pressured by such cultural norms to put her child in such a situation.
One reason could be a total breakdown of family order, like if the son has some serious mental issues that make him unable to understand proper behavior. Another could be extreme anger or resentment due to some past trauma within the family that has made him act out in this unacceptable way.
One reason could be protection. Moms often want to shield their children from harm, so they might force their way in front. For instance, if there's a bully around, she'll put herself between the bully and her child.
One reason could be that the mom has a very liberal view on gender and she oversteps boundaries in trying to instill that in her child too early. Another might be that she is using the child to fulfill some sort of personal fantasy or wish she has related to having a different - gendered child.
She might be trying to break gender stereotypes. By dressing you up as a girl, she could be teaching you that clothing doesn't have to be strictly for a certain gender. Another reason could be that she found some really cute girl's clothes and thought it would be adorable on you.
One reason could be for fun. Moms often like to play around with their kids and dressing them up in different ways can be a source of amusement for both. Another reason might be for a photo opportunity. A cross - dressed child can make for some really cute and unique pictures.