Another plot device is the 'betrayal and forgiveness' arc. There could be a situation where one of them betrays the other's trust, perhaps due to family pressure or misunderstandings. But then, through a series of events, they come to forgive each other and their love grows stronger as a result.
One common plot device is the 'forced proximity'. For example, they might be paired together for a school project or locked in a room at Hogwarts. This forces them to interact and start to see each other in a different light.
A plot device often used is the threat of separation. Maybe there's a situation where Draco has to go away for some reason, like a mission or a family obligation. Harry's possessiveness kicks in as he doesn't want Draco to leave. This situation can be used to really dig deep into Harry's feelings and show how far his possessiveness can go. He might try to find ways to keep Draco with him, even if it means going against rules or other people's wishes.
A typical plot device could be the influence of an outside force. Say, a kind wizard or witch comes to the Dursleys and makes them understand the importance of Harry and his magic, and then they start to love him. Also, it could be that Harry himself shows extraordinary kindness towards the Dursleys in a difficult situation, which melts their cold hearts and changes their attitude towards him.
One common plot device is the 'what - if' scenario. For example, what if Hermione had been the one to save Harry from the Dementors instead of his father's Patronus? This can lead to a deeper emotional connection between them. Another is the 'arranged - relationship' plot, where they are forced to pretend to be in a relationship for some magical reason, but end up falling in love for real. Also, the 'jealousy' plot device, where they get jealous of each other's relationships with other characters and realize their true feelings.
One common plot device is the redemption arc. Narcissa may be portrayed as turning away from the dark side, and Harry, seeing this change, is drawn to her. Another is the protection plot, like Narcissa protecting Harry for some reason, which then leads to a bond between them. And sometimes, there's a magical bond or curse that forces them to interact and eventually fall in love.
A common plot device is the 'forbidden love' angle. Since they are from different species that might have been in conflict before, their relationship is often seen as something not allowed. For example, their families or communities might oppose it at first.
Often, there's the use of miscommunication. The kidnapper may have a wrong idea about the love interest that led to the kidnapping. For instance, thinking the person loves them when they really don't. Also, the setting can be a plot device. If the kidnapping takes place in a remote, mysterious location, it adds to the suspense and the sense of danger.
One common plot device is time - travel. A character might go back in time and accidentally change something that makes Draco Harry's son. Another is a powerful magical curse or blessing that alters family relations. For example, a curse on the Malfoy family that can only be broken if Draco is 'adopted' into Harry's family in a magical sense.
One common plot device is the revelation of Snape's hidden motives. As he heals Harry, we might discover that his actions are not just out of duty but also out of a long - held, unspoken love or loyalty. Another is the use of rare and dangerous ingredients in the potions he makes for Harry's healing.
One common plot device is the transfer of Harry's knowledge from the wizarding world to Middle - earth. For example, she might use her knowledge of potions to create new substances in Middle - earth. Another is her being an outsider who has to prove herself. Just like in the Harry Potter series, fem Harry has to gain the trust of the LOTR characters. And often, there's a plot about her finding a new purpose in Middle - earth, something that ties her to the fate of the Ring.
One common plot device is Draco flirting with other girls in front of Hermione. For example, he might shower another girl with compliments about her magical abilities which Hermione takes as a personal slight since she prides herself on her own skills. This immediately makes her jealous and sparks a series of events where she tries to show Draco that she doesn't care, but actually does.