Well, they could be on a date. Maybe they go to a fair. As they're walking around, Usui spots a beautiful flower and he plucks it. He then tucks it behind Misaki's ear and before she can react, he gives her a quick kiss on the lips. It's a spontaneous and sweet moment.
There could be a situation where Misaki is in danger. Usui comes to her rescue. After the danger has passed, Misaki is so relieved and grateful that she throws her arms around Usui. Usui, taking advantage of the moment, cups her face and kisses her deeply. This kiss is full of pent - up emotions from both of them.
One possible fanfiction could be that Misaki and Usui are in the school garden. Usui surprises Misaki with a gentle kiss on the cheek as a way of teasing her. Misaki blushes furiously and tries to scold him but ends up just stuttering, which makes Usui laugh.
Well, they could start a family. Misaki might be a bit hesitant at first because she's always been so focused on her work and school. But Usui would be so excited about having kids. He would be the kind of dad who's very involved and loving. They could also travel together, exploring different parts of the world and having new adventures.
One possible fanfiction could be that Usui and Misaki have a small, intimate wedding. They might choose a beautiful garden as the venue. All their friends from school would be there. Usui would look dashing in his suit, and Misaki would be a stunning bride. Their relationship has had its ups and downs, but this moment is the culmination of their love. They exchange heartfelt vows, promising to be with each other through all the good and bad times.
Yes, there are some out there. You can start by looking on fanfiction websites like FanFiction.net or Archive of Our Own. However, keep in mind that 'lemon' often implies mature content, so make sure it adheres to the website's rules and your own comfort level.
In fanfiction, Misaki could develop by learning to balance her work, school, and love life better. She could start to see that having Usui by her side is an asset rather than a distraction. Usui could develop his relationship with his family more deeply, which in turn affects his relationship with Misaki. Maybe he discovers some family secrets that make him more determined to be a better person for Misaki. Also, Misaki could become more assertive in her relationship with Usui, not just following his lead all the time but also taking the initiative in their relationship, like planning dates or surprises for him.
One common theme is the exploration of their relationship in more intimate ways, given the 'lemon' aspect. Another could be the power dynamics between them, as in the original series there was a bit of that with Misaki being the strong - willed maid - president and Usui being the mysterious and charming guy.
One possible plot could be the initial shock and adjustment. Usui and Misaki find out about the pregnancy and they have to deal with their own emotions first. Misaki might be worried about how it will affect her studies and her role as a maid. Usui, on the other hand, would be very supportive but also a bit nervous about becoming a father. They would then start to plan for the future, like looking for a bigger place to live and getting ready for the baby's arrival. Their friends would also play a role, some being excited and others might be a bit skeptical at first.
Well, one interesting plot could be that Misaki and Usui accidentally swap bodies. This would lead to a lot of comical situations as they try to navigate each other's lives while in the wrong body. Another idea is that a new student arrives at the school who is a childhood friend of Usui's and is very possessive of him, which causes tension in Usui and Misaki's relationship. And yet another could be a story where Misaki loses her memory and Usui has to make her fall in love with him all over again.
One popular plotline is Usui and Misaki going on a secret date. They have to be careful because of Misaki's double life as a maid and student council president. Another is when they face a misunderstanding that threatens to break their relationship but they eventually work through it.
Their relationship would likely become more intimate and serious. With a baby on the way, they would have to depend on each other more. Usui would become more protective of Misaki, and Misaki would rely on Usui for emotional support.