One good winterwatcher fanfiction could be 'Winter and Moonwatcher's Adventure'. It might explore their relationship in a new and exciting way, perhaps taking them on a journey across Pyrrhia to discover a long - lost power. Another could be 'Winter's Secret Feelings for Moonwatcher' which delves deep into Winter's emotions that he might be hiding from everyone, including himself. There could also be a fanfiction titled 'Moonwatcher and Winter: A Bond Beyond Tribes' that focuses on how their friendship or possible romantic relationship overcomes the traditional tribal boundaries in the Wings of Fire series.
You can start by looking on fanfiction websites like Archive of Our Own (AO3). It has a large collection of Wings of Fire fanfictions, including many winterwatcher ones. Another place is FanFiction.net, which also has a decent number of such stories. There are also some Wings of Fire - specific forums where fans might share their own winterwatcher fanfictions or recommend ones they've read.
One great Winterwatcher fanfiction could be 'Winter's True Heart'. It delves deep into the relationship between Winter and Moonwatcher. The author beautifully portrays Winter's struggle with his emotions and his growing affection for Moon. Another interesting one is 'The Winter - Moon Bond', which focuses on how their unique connection evolves over different challenges they face in the world of Wings of Fire.
You can start by looking on fanfiction websites like Archive of Our Own (AO3) or FanFiction.net. Just type in 'Wings of Fire Winterwatcher' in the search bar, and a whole list of relevant fanfictions will pop up. AO3 usually has a great tagging system that can help you filter out exactly what you're looking for in terms of plot, rating, etc.
The combination of the angel's purity and the devil's allure in a love story is what makes it so appealing. It explores themes of forbidden love and defying expectations, which draws readers in and keeps them hooked.