Well, I've heard that some fanfictions explore their complex relationship in really unique ways. However, it can be a bit hard to find the really good ones. You could also check out fanfiction.net. Just keep in mind that the quality can vary a great deal.
The popularity might be due to the intense relationship between L and Light in the original 'Death Note'. Fans are intrigued by their intellectual battles and so they like to explore different scenarios in fanfiction, including the 'lemon' ones.
A common theme is the exploration of the power dynamic between L and Light. In the original series, they are adversaries, and in fanfiction, this often gets reimagined in different ways. Another theme is the idea of trust and betrayal. Since they are constantly trying to outwit each other, fanfictions play with the concept of whether they can truly trust one another. Also, the theme of hidden emotions is quite prevalent, as the characters in the original are not very open about their feelings, and fanfiction writers love to explore what lies beneath the surface.
One common theme is the exploration of their intellectual rivalry turning into something more. Their constant mind games in the original series can be reimagined as a form of flirtation in yaoi fanfiction.
There might be a fanfiction where L discovers Light's identity as Kira much earlier, but instead of immediately trying to expose him, he decides to study Light's motives and actions more closely. This could involve some intense psychological battles between them as L tries to figure out what makes Light tick and Light tries to outwit L in a different way.
Well, in many 'Light x L Death Note Mate Fanfiction', a common theme is redemption. Light, who is a morally gray character in the original, often has a journey towards redemption in these fanfictions. Also, the theme of trust is very prevalent. Given their initial positions as enemies, building trust between Light and L is a major part of these stories. Additionally, there's the theme of facing external threats together, which forces them to rely on each other more and develop their relationship further.
I'm not sure about a specific 'Death Note L and Light lemon fanfiction' off - hand. But you can start by looking at the top - rated ones on different fanfiction platforms. Usually, the ones with high ratings tend to have interesting storylines. You can also check for those that are updated frequently as it might indicate an engaging plot that keeps readers coming back. Some might focus on the power struggle between L and Light in a more romantic or emotional context, which could be really fascinating to read.
One common theme is the exploration of L's more private and emotional side. Since he's such a mysterious character in the original, fanfictions often delve into his feelings. Another theme could be the forbidden or secret relationships he might be in, which ties into the 'lemon' aspect, like a relationship with someone he shouldn't be involved with in the context of the Death Note world.
One common theme is the exploration of L's hidden emotions. Since L is such an enigmatic character in the original, fanfictions often try to dig deeper into his feelings, especially when it comes to romantic or more intimate relationships. For example, his struggle between his logical mind and new - found emotional desires.
One great 'l x light' Death Note fanfiction is 'The Game of Shadows'. It delves deep into the complex relationship between L and Light. It shows their intellectual battles in a different light, adding new twists to the original plot.