Hurmat-e-Musaaharah

Q: I have committed zina with my fiancé's mother mistakenly. She is my mother’s sister and I repent to Allah and ask forgiveness for my mistake. Nobody knows about this except ﷲ and us . I’m very nervous that if I do nikah with her daughter then the nikah will be valid or not and if I have children with her daughter.

I don’t understand what to do and currently it’s highly impossible to step back for marrying her daughter because if I try to step back there will be a big problem. Please bring out a solution for me. I love my fiancé very much and I can’t leave her. 

Q: What is the ruling of a man (Zaid) marrying a woman (Fatima). In the case where Zaid's father touched Fatima with lust or without, in the past. (Fatima was not in any relationship with the father of Zaid)

Q: What is hurmat-e-musaaharah and what is the ruling about it in detail?

Q: Will hurmate-musaaharat be established between mother and son if the mother is divorced and married to some other person (who is not the father of this son) and the son is not married.

Q: Does hurmat mushaharah become established if a person hugs his father but he has strange feelings in his private part. He was scared during the event and did not get a full erection, however he is not sure about any minor movements that he did not notice. But he thinks that the minor movements (very small movements) were because of nervousness. He did not get any sexual thoughts. He was also a little bit scared during the event.

Q: If a father touches the bare skin of his step daughter with lust in the dark because he thought that it was his wife, but when he finds out that it was his step daughter, he moves away immediately. Will hurmat musaaharah be established?

Q: I have some questions about hurmat musaharah.

1. Is it established between a mother and daughter?

2. Is it established if one has wet dreams about incest or a sexual dream that has mahrams?

3. Is hurmat cancelled if parents remarry and sincere repentance is made? 

4. Lust is a strong sexual desire. If I don't feel a strong desire but I feel some type of lustful feeling that I try my best to control inside my heart at the time of touching, is this hurmat musaharah?

Q: If a woman unintentionally (accidentally) looks at the private part of her adult son without clothes by mistake and she lowers her gaze, but due to looking at the private part without clothes she feels lust inside and she feels some discharge coming out of her private part. Even though she does not have any lust for her son and she lowered her gaze as well, will it constitute hurmat musaharat?

Q: Does looking at the private parts of a woman also establish hurmat-e-musaaharah even if one does not touch the other person?

Q: If hurmat-e-musaaharaah has been established and the talaaq has not taken place. Thereafter the children were born. What about the spouses relationship and what about the children's?