It could also be a new character created specifically for the fanfiction. Maybe a dark sorcerer who has an ancient grudge against Aelin's lineage. This antagonist could be using her tied - up state to perform some dark ritual or to extract information about the lost magic that Aelin might possess.
Maeve could be a likely antagonist. Given her history with Aelin in the original 'Throne of Glass' series, she might be the one who has put Aelin in this tied - up and vulnerable state. Maeve is known for her devious and power - hungry nature, and this could be another one of her cruel schemes to gain an upper hand.
Another possibility is that the antagonist is an old acquaintance of Aelin who has turned against her due to jealousy or a thirst for power. This person, seeing Aelin in a weakened state while tied up, might try to take over her position or steal something precious from her, all while gloating over her misfortune.
One interesting plot twist could be that instead of being in a vulnerable position, Aelin's tied - up state is actually part of a clever ruse she has devised to deceive her enemies. She might be using it to gather information or to make her foes underestimate her, and then she springs a surprise attack when they least expect it.
Rather than delving into such inappropriate fanfiction ideas, we could consider fanfictions that focus on Celaena's skills as an assassin. For example, some fanfics might explore how she hones her skills further, or how she uses her skills to protect those she cares about in new and exciting scenarios. There are also fanfics that might focus on her relationships with other characters like Chaol or Dorian in a more positive and non - inappropriate way.
Rowan could be one of the most interesting. His loyalty to Aelin and his own strength and backstory add depth. He might be on a quest to save her, and his actions and decisions can be really engaging. Then there's Lysandra. Her shapeshifting abilities and her complex relationship with Aelin make her a fascinating character. She could be using her skills in unique ways to help Aelin in the fanfiction.
One common theme could be power struggles. In the 'Throne of Glass' world, power is a major factor, and in fanfictions about Aelin as a slave, it can show her journey to reclaim power. Another theme might be redemption. Aelin may be seen as having to atone for past mistakes or misfortunes. Also, the theme of friendship and loyalty often plays a role. Her friends might be trying to rescue her, highlighting the strong bonds in the story.
Some Tumblr blogs are also dedicated to sharing and discussing Throne of Glass fanfiction. You can search for relevant tags like #AelinRowanFanfiction or #ThroneofGlassFanfic. There, you may find links to some really good stories or even read some short fanfiction pieces directly on the blog posts.
In a Throne of Glass fanfiction where Aelin is a sex slave, the story could develop in many ways. One way could be her finding inner strength to resist. She might use her wits and any small advantages she has in her situation to gradually undermine those who hold her captive. For example, she could befriend a guard or servant who then helps her in some way.
The themes might include redemption. Maybe she has to atone for some past mistakes while in this situation. Also, the theme of hope. Despite the horrible circumstances, she could hold onto hope of freedom and a better future. There could also be a theme of transformation, as she would be changed by this experience, either for better or worse.
One of the best moments could be when they have a tender moment of understanding in the midst of a battle. In many fanfictions, Rowan and Aelin communicate without words, just through their eyes. Their connection is so strong that they can anticipate each other's moves. Another great moment is when they share a private joke or memory that only they understand. It shows the depth of their bond and how they have created their own little world within the story.
It could be a new demigod who has a grudge against Percy and somehow convinces Annabeth that Percy is a threat, leading to her tying him up. So this new demigod would be the antagonist.
There could be a fanfiction where Aelin is injured and Rowan has to use all his skills and love to nurse her back to health. It would show his deep devotion to her. He would stay by her side, protect her from any threats, and in the process, their relationship would become even more intense.