One common theme is friendship. Their relationship might be explored in the context of growing up together and the bond that forms from shared experiences.
Sure. You can try looking on fanfiction.net. There are often many well - written stories about this pairing there. Just search for 'thalia x luke' in the search bar.
Yes, it could be. If they are fans of certain stories or universes, loving fanfiction is quite normal as it allows them to explore different scenarios and character developments within those fictional worlds.
Rather than the 'make love' aspect, consider fanfictions that deal with their family - like relationships. For example, how they support each other like siblings would. Or fanfictions that center around their shared goals and dreams, and how they work towards achieving them together. This way, you can still enjoy stories about Luke and Thalia without the inappropriate content.
One possible plot could be that they face a lot of challenges. Maybe they are in a world full of danger and they have to protect their unborn child. They might need to find a safe place to stay, away from their enemies. Thalia could be using her skills to keep them safe while Luke tries to figure out how to provide for their future family.
I'm not sure if there is a specific 'Thalia and Luke make love fanfiction' available online. Fanfiction can cover a wide range of relationships and scenarios, but this particular one might be difficult to find. It also depends on the fandom and the platforms where fanfictions are hosted.
One possible plotline could be that they are long - time friends who gradually develop feelings for each other and the kiss is a culmination of that slow - burn romance. For example, they might go through various adventures together, and during a particularly emotional or dangerous moment, they share a kiss.
Another possibility is a group or organization that has different ideals. If Thalia and Luke are part of a group that values something different from them, that group could oppose their decision to have a child and become the main antagonists, trying to stop the pregnancy or take the baby away once it's born.
I'm not aware of any specific 'Luke and Thalia make love fanfiction' that would be considered appropriate. Fanfiction often involves a wide range of interpretations, but such a theme might not be in line with the original nature of the characters in many cases.