One main aspect could be the realization of one's true gender identity. It might start as a feeling that just doesn't go away. Another aspect is the decision - making process. Deciding to pursue a sex change is a huge step. And then there's the medical aspect, like hormone replacement therapy.
I don't possess a sex change story myself. People who go through sex change usually face numerous challenges. They first have to deal with society's expectations and norms that may not be in line with their true selves. Then, the process of changing their physical appearance to match their gender identity is complex. It may include hormonal changes that affect their mood, body shape, etc. Surgery also comes with risks and a long recovery period. But through it all, they are on a path to being their true selves.
One possible explanation could be that the aliens have a different understanding of biological forms and are experimenting on humans. They might see sex change as a way to study human adaptability or to create new types of beings for their own purposes.
As far as I know, there is no widely known 'collar sex change story' in mainstream literature or common knowledge. It seems like a rather unique and perhaps even an original concept that you've brought up.
One possible 'collar sex change story' could be in a fantasy world. There was a magical collar that was enchanted by an old wizard. When a person put on this collar, it started to change their physical form including their sex characteristics. A young girl, out of curiosity, put on the collar and found herself transformed into a boy. She then had to adapt to a whole new life and identity in that different gender.
The 'eldritch sex change story' could potentially be about a transformation that defies normal understanding. In eldritch literature, things often don't follow the rules of our world. Maybe it's a story where a being, perhaps a non - human or a creature from another dimension, experiences a sex change as part of some eldritch ritual or due to some strange eldritch influence. This could be a way to explore themes of identity and the disruption of the natural order in a very strange and otherworldly context.
One inspiring sex change story is that of Jazz Jennings. Jazz has been very open about her journey from a very young age. She has become an advocate for transgender youth, sharing her experiences of growing up as a transgender girl, facing challenges at school and in society, but still remaining strong and positive. Her story has inspired many others to accept themselves and fight for their rights.
One of the major ethical issues is the violation of an individual's autonomy. A person has the right to decide about their own body and gender identity. Forced sex change goes against this fundamental right. It can also lead to long - term psychological harm as the person may feel alienated from their new identity which was imposed on them rather than self - chosen.
Since I don't know the specific 'eldritch sex change story', it's hard to say who the main characters are. But they could be some sort of eldritch beings like tentacle - covered monsters or shadowy figures.
In real life, biological sex change through natural means for an adult is not possible in the sense of a sudden, magical transformation like in some fictional stories. However, transgender individuals can undergo medical and surgical procedures over a period of time to change their gender presentation. But this is a complex process involving psychological evaluation, hormonal therapy, and surgeries, which is different from the idea of a sudden 'wife change sex' as might be misconstrued from the title.