This is an extremely awkward and inappropriate situation. It goes against the norms of a healthy family relationship. You need to communicate your discomfort clearly. You can say 'Mom, this is not a topic that is suitable for discussion between us. Our conversations should be positive and appropriate. I hope this never comes up again.' If possible, try to distance yourself from such inappropriate conversations in the future and focus on building a more appropriate and healthy relationship.
We should avoid such inappropriate topics. Instead, we could focus on positive family stories like 'times when mom showed great kindness' or 'instances of mom's selfless love'.
Often, Mom Japanese stories have strong moral lessons. For example, stories like 'Issun - boshi' teach about the rewards of being brave and kind in the face of difficulties.
This is a very inappropriate and uncomfortable situation. You should firmly and clearly tell your mom that this is an unacceptable topic. For example, you could say 'Mom, this is not an appropriate thing to ask me. I'm very uncomfortable with this conversation.'
Yes, step - mother - step - son relationships are sometimes explored in Japanese dramas, but not extremely common. Some dramas may touch on complex family relationships including those of step - families. However, they are often portrayed with a focus on emotional growth, family bonds, and the challenges of adjusting to new family dynamics rather than just a 'love story' in a romantic sense.