One great 'Ben x Gwen romance fanfiction' is 'Ben and Gwen's Unspoken Love'. It beautifully captures their relationship growth. The author does a wonderful job of showing the unspoken feelings between them through various adventures they share. It's really a must - read for fans of this pairing.
Well, 'A Ben and Gwen Love Story' is quite popular. It delves deep into their characters and how their feelings for each other develop over time. The story is filled with sweet moments and also some tense situations where they have to face their feelings head - on. It's a great take on the Ben x Gwen romance concept.
There's this fanfiction called 'Ben and Gwen: A Romance in the Making'. It starts with their normal bickering but then slowly reveals the underlying romantic feelings. It has a great plot that weaves in elements from the original series and gives a fresh perspective on their relationship. It shows how they might overcome the obstacles in their way to be together.