In Hermione tempts Snape fanfiction, the relationship between them could be a way to explore different power dynamics. Hermione, as a young and brilliant witch, might try to tempt Snape out of his brooding shell. It could also be a means to rewrite the Hogwarts narrative. Maybe in these stories, they form an unlikely alliance against a new dark force in the wizarding world, and Hermione's attempts to tempt Snape are part of her strategy to gain his cooperation.
Perhaps in the fanfiction, Hermione tempts Snape by challenging his beliefs. Snape has his own set of views on magic, house rivalries, etc. Hermione, being the fearless thinker she is, could question him on these things. This would make Snape re - evaluate his long - held ideas and create an interesting dynamic between them.
The contrast between the two characters can be really engaging. Ichijou Masaki might have certain traits and Shiba Tatsuya has his own unique qualities. Their interactions can lead to interesting storylines, like how they might overcome differences or work together in a fictional scenario.
We don't have enough information to know exactly who Karen is. She could be an ordinary person, a student, a teacher, or just someone who likes to read stories.
Given only 'dateline karen read story', Karen's identity remains a mystery. She might be a staff member at Dateline who was reading a story for work purposes. Or she could be a person who was interviewed by Dateline and was reading a story during the interview, or she could be an ordinary person whose story - reading experience is being highlighted in relation to Dateline.
Hermione might initially be very suspicious. Given her intelligence and wariness, she would not easily fall for the temptation. She would likely question Snape's motives and try to analyze the situation from all angles.
Another option is to ask in relevant fan communities. There are many forums and groups dedicated to the series that these characters are from. Post a request asking for ichijou masaki x shiba tatsuya fanfic recommendations. Fellow fans might be able to point you to some great pieces that they've come across.
Without more context, it's hard to say exactly who they are. They could be a family, with Karen Ann being an individual within the Quinlan family. Maybe they are people who have had some interesting or important experiences that are worth sharing in this story.