One common theme is friendship turned into love. Since they start as friends in the original series, many fanfictions explore how that friendship could evolve into a romantic relationship over time.
One common theme is the exploration of their relationship dynamics. Since they might have different personalities, fanfictions often delve into how they interact, argue, and make up.
One common theme is the exploration of their unlikely relationship. Given their different personalities and backgrounds in the original source material, fanfics often delve into how they might come together. Another theme is power dynamics, as Spike has his vampire nature and Willow has her growing magical powers.
Adventure is also quite common. They might embark on quests or travels in different fictional settings. For example, they could be exploring a mysterious ancient ruin together, looking for some lost artifact. And during this adventure, their bond gets stronger.
A lot of 'hunter x willow fanfiction' has the theme of adventure. Since both characters are in a world full of magic and danger, fanfictions often send them on new adventures together. Also, the theme of trust is quite prevalent. Hunter has had issues with trust in the past, and Willow is a character who values trust, so their relationship in the fanfictions often revolves around building and maintaining trust. And then there's the theme of discovery. They discover new things about each other, about their world, and about themselves as they journey together in these stories.
Fanfiction.net is also a good place. There are many Buffy - related fanfics there, and you can use the search function to specifically look for Buffy x Willow ones. Just be aware that the quality may vary.
One great Buffy x Willow fanfiction is 'Soulmates Beyond the Grave'. It delves deep into their relationship, exploring how their bond might develop in a post - apocalyptic setting. The story has a great plot with a lot of character development.
One great place to find sundew x willow fanfiction is Archive of Our Own (AO3). There are many talented authors who write about this pairing. You can search by the tags'sundew x willow' and sort through the results based on popularity or date updated.
Another theme is the exploration of their relationship development. This can include how they first realize their feelings for each other, from being just friends to falling in love. It could involve cute moments like blushing, shy glances, and small acts of kindness.
You can start by looking on Archive of Our Own (AO3). It has a large collection of fanfiction for various fandoms, including Buffy the Vampire Slayer which Spike and Willow are from. Just use the search function and type in 'Spike x Willow' and you'll get a list of relevant stories.