One plot idea could be that Leon and Ashley, after their adventures, find themselves in a peaceful post - mission life. They start to build a relationship, and the pregnancy comes as a surprise but a welcome one. They then have to face the challenges of preparing for a new life together, like finding a safe place to live and dealing with the reactions of their friends and former colleagues.
For Leon, he could develop a new sense of purpose. He might start to think about legacy and what kind of world he wants his child to grow up in. So he could get involved in more community - building type of activities within their world. Ashley would likely become more empathetic. As she experiences the changes in her body and the new life growing inside her, she might be more in tune with the feelings of others and try to create a more harmonious environment for her family.
A fanfiction might explore how Leon and Ashley deal with the trauma they endured during the events of the game. They support each other, and Leon teaches Ashley some self - defense moves. Their relationship grows from a protector - protectee one to a deep friendship.
A fanfiction could be set a few years after the game. Ashley is now involved in some diplomatic work related to bioterrorism prevention, and she calls Leon in for advice. Their old feelings start to resurface as they work together again.
Romance is also a big theme. Writers like to develop a romantic relationship between them, showing how their feelings for each other might have grown during their time together in the game's story. They might write about secret glances and unspoken feelings that gradually turn into love.
Well, in fanfiction, the first kiss between Leon and Ashley could happen in a very tender moment. Maybe they're in a quiet, safe place for a short while during their adventure. Ashley looks at Leon with admiration and gratitude for always protecting her. Leon, feeling the same deep emotions, cups her face and their lips touch softly, as if time stops for that brief, beautiful moment.
There could be a fanfiction where Leon and Ashley's love story was a bit more of a slow - burn. After they were separated following their initial adventure, they both couldn't stop thinking about each other. Years later, they were reunited by chance at an event. At first, it was awkward, but then all the old feelings came rushing back. They started spending time together, reminiscing about their past experiences, and gradually, their friendship turned into a deep and passionate love.
A romantic plot could be that Leon gets injured during a fight while protecting Ashley. Ashley then takes care of him, and during this time of vulnerability, they share their first kiss. It's a moment of raw emotion as they realize how much they mean to each other.
Another place to look for Leon x Ashley fanfiction is Archive of Our Own (AO3). There, you can find a variety of interpretations. Some stories might explore their relationship post - game, how they deal with the trauma of their experiences together and grow closer as a result.
One possible scenario is that they are trapped in a dangerous situation and think they might not make it out alive. In that moment of desperation and closeness, they share a kiss. Another could be when Ashley is injured and Leon is taking care of her. The tender care he shows makes her feel a strong affection, and she kisses him. Or perhaps after a victory against a major enemy, the rush of adrenaline and the sense of accomplishment leads to the kiss.