Well, a possible plot could be that in the Naruto universe, a portal opens up and out come some of the Overwatch female heroes. Naruto, being Naruto, is intrigued and wants to help them find their way back. As they stay in his world, they learn about chakra and Naruto's way of life. In return, they teach him about their advanced technology. This interaction could lead to some romantic feelings developing among them, creating a harem - like situation. For instance, Mercy might be fascinated by Naruto's healing abilities which are different from her own and a bond could form between them.
One plot idea could be that the Overwatch heroes are transported to the Naruto universe. They have to adapt to the chakra - based powers and the different combat styles. Meanwhile, they might also introduce some of their own technology and teamwork concepts to the Naruto characters, leading to some interesting interactions and battles.
One idea could be Naruto somehow finds himself in a situation where he has to team up with Tayuya frequently. As they interact more, a harem starts to form around Naruto, with Tayuya being one of the key members. The plot could involve them going on missions together and Naruto gradually realizing his feelings for Tayuya among the others in the harem.
One idea could be that Naruto accidentally enters a different dimension where he meets Fuu and gradually attracts other characters who form a harem around him. They could go on adventures together, fighting against new threats in that dimension while Naruto tries to find his way back home.
Maybe an evil villain casts a spell on Naruto that draws a harem of female ninjas to him, thinking it will distract him. But Naruto uses this new situation to his advantage. He has the girls help him train in new ways and they all form a unique bond as they work together to face the real threats to the village.
One idea could be that Naruto, while on a mission in an unknown land, meets Guren and gradually other characters are attracted to him, forming an unexpected harem. Maybe Naruto's unique ninja skills and his kind heart draw them in.
A more complex plot could be that there is a powerful enemy that threatens both Naruto's world and the world of Rias. Naruto and Rias's harem have to team up to defeat this enemy. Along the way, they face many challenges that test their abilities and relationships. Naruto's positive attitude and never - give - up spirit start to influence the members of the harem, and they in turn show Naruto new ways of using magic and power.
One idea could be that Naruto discovers a hidden realm full of monster girls. They are initially wary of him but as he shows his kind heart and powerful ninja skills, they start to fall for him. For example, a fox - like monster girl might be drawn to his own connection with the nine - tailed fox.
A possible plot could involve a competition among the members of Naruto's harem. Since they are all in love with Naruto in this genderbend scenario, they might compete in ninja tasks or challenges to prove their worth to Naruto. Maybe there could be a tournament where they show off their jutsu, and Naruto has to judge not only their skills but also how their actions affect their relationships with him.
One idea could be that Naruto discovers Tayuya has a group of friends who are also interested in him, creating a harem situation. He has to navigate his feelings for Tayuya while also dealing with the others. Maybe they all go on missions together and Naruto gradually realizes his deeper connection with each of them.
Another plot could be that Naruto is mistaken for an Avatar in the Avatar world. As he tries to clear up the misunderstanding, he gets involved in local politics and relationships. The female characters see his honesty and kindness, and gradually, a harem - like situation develops around him.