One great Evangelion Shinji x Asuka fanfic could be 'The Redemption of Their Bond'. It delves deep into how Shinji and Asuka could overcome their emotional traumas and grow closer. The story shows Shinji becoming more assertive and Asuka learning to be more vulnerable, which makes their relationship development very interesting.
The popularity of Evangelion Shinji x Asuka fanfics lies in the complex relationship between the two characters in the original series. Their relationship is full of tension, from hatred to a possible underlying love. Fanfic writers can explore these emotions in more depth and create different scenarios for their relationship to develop.
Well, in some fanfictions, the kiss might be a symbol of redemption. Shinji has his own insecurities and Asuka her pride. When they kiss, it could be like they are redeeming each other from their own self - loathing. It might also be a way to show that despite all the chaos and the end - of - the - world scenarios in Evangelion, love (or at least a form of it) can still find a way. For example, it could be the start of a new phase in their relationship where they support each other more and face the challenges together.