They could develop a mentor - mentee relationship. Naruto, with all his new - found knowledge and power, could mentor Yugao in some aspects. Or it could be the other way around, with Yugao teaching Naruto some of the more traditional ninja skills she has mastered.
Perhaps Naruto and Yugao go on a mission outside the village after the war. They encounter some remnants of the enemy forces who are still causing trouble. Along the way, they bond over their shared love for the village and their determination to keep it safe. They might also discover new jutsu or abilities during this mission.
Sakura could be one. She has a long - standing relationship with Naruto and might be part of the harem. Also, Hinata. Given her feelings for Naruto, she could be drawn into this situation. Shikamaru might also be included, not in a romantic way for Naruto but as a friend who gets involved in the group dynamic. And Kiba, with his brash personality, could add an interesting element to the group.
Well, Naruto could be a part of it. He has a big heart and is always attracted to strong - willed people. His positive energy could bring a lot to the harem dynamic. Another could be Kakashi. He has a long - standing relationship with Yugao and his cool, collected nature would contrast well with others in the harem. Also, Rock Lee might be included. His unwavering dedication to his beliefs and his unique fighting style could make for an interesting addition to the group.
It could be that they are wrongly accused of a crime they didn't commit. Maybe a major incident occurs in the village and they are made scapegoats. So, they are banished as a result of this false blame.
In a 'naruto and yugao harem fanfic', the story could start with Naruto and Yugao being assigned a special mission together. During this mission, they encounter different ninja clans. Some members of these clans become interested in Naruto because of his reputation as a hero of the village. Yugao, on the other hand, catches the eye of some because of her mystery and combat expertise. As time passes, more characters are added to their circle, resulting in a harem situation. There could be love triangles, or even more complex relationship webs as they all strive to achieve their goals while dealing with their feelings for each other.
Another could be a story set in Konoha where Yugao helps Naruto train in a specific jutsu. Since she has her own set of skills, she might be able to teach Naruto something new. Maybe it's a stealth - related jutsu, which Naruto initially struggles with but with Yugao's patient guidance, he starts to improve.
One great fanfic could be about Naruto and Yugao Uzuki teaming up on a secret mission. Maybe they have to infiltrate an enemy stronghold. Yugao Uzuki's skills in assassination and Naruto's unique abilities would make for an interesting dynamic.
One common theme is the idea of secrecy. Since Yugao is a bit of a mysterious character in the Naruto world, many fics play on the idea of their relationship being a secret at first.