One plot idea could be that they have to keep their marriage a secret from their enemies at first. This would add an element of mystery and danger as they try to balance their normal heroic duties with their new relationship status.
One popular 'Tails and Rouge married' fanfiction might be 'A New Life Together'. It explores their life after getting married, like how they deal with daily challenges and the reactions from their friends in the Sonic universe.
One common theme is adventure. Since both Rouge and Tails are quite active characters, many fanfictions involve them going on exciting quests or exploring new places.
Friendship is another theme. They may start off as unlikely allies but grow to respect and care for each other. For example, in some fanfictions, Rouge helps Tails overcome his insecurities, and Tails teaches Rouge about loyalty.
One possible theme could be friendship. Even in a rather odd situation like sharing a bath (in the context of the fanfiction), it could explore how their friendship develops or is tested. Another theme might be discovery, as they might discover new things about each other during this situation.
One common theme could be adventure. Since Tails is known for his inventiveness and Rouge for her thieving skills, they might go on some sort of adventure together in the fanfiction. Another theme could be friendship, as they develop a deeper bond through their shared experiences.
One common theme could be adventure. Since the characters are likely to be in an action - filled world, fanfictions might center around them going on exciting adventures together.
One common theme is the idea of opposites attract. Tails is often seen as the innocent, tech - savvy character, while Rouge is the more sultry and mysterious one. Their kiss can symbolize the bridging of these two very different personalities.
In these fanfictions, the theme of overcoming obstacles is quite prevalent. Given their different natures and backgrounds, there are bound to be obstacles in their relationship. It could be differences in their values or external factors like their friends not approving. Another common theme is the slow - burn of their relationship. It doesn't happen all at once, but rather gradually, which makes the story more interesting and engaging as readers get to see the development over time.
One great 'rouge and tails fanfiction' is 'The Adventures of Rouge and Tails' which features their exciting escapades together. It has a really engaging plot that keeps you hooked from start to finish.