He might be initially shocked and confused. Since Naruto is not used to having someone else's mind in his body, he could struggle to control his actions at first.
Well, Naruto is a very adaptable character. So after the initial shock, he would likely start to work with Ino. He might come up with creative ways to use their combined skills. He could think of ways to use his own chakra and physical strength along with Ino's mental abilities. For instance, he could use Ino's mind - reading skills to anticipate an enemy's moves while using his own combat techniques to counter them.
When Ino uses mind transfer on Naruto in a fanfic, it could be the start of a very different story arc. Naruto's mind is full of his past experiences, his dreams, and his connection to the Nine - Tails. Ino entering his mind could accidentally awaken something within Naruto that was dormant. Maybe a new form of his chakra or a forgotten memory that holds the key to a mystery in the story. It could also create a rift between them if Naruto feels violated by Ino's intrusion. And as Ino tries to make sense of what she saw in Naruto's mind, she might have to make some difficult decisions about whether to keep it a secret or share it, which could further drive the plot forward.
In a fanfic where Ino uses mind transfer on Naruto, she might use it to help him in some way. For example, if Naruto was in a coma or had some mental block. She could enter his mind and try to find a solution. However, it could also go wrong. She might get trapped in his mind if there are some unforeseen mental defenses or if she overstays her welcome. This could create a whole new plotline where the other characters have to find a way to get her out.
A more complex plot could be that an enemy uses a device to force Ino to transfer her mind into Naruto. The enemy then plans to use Naruto's body with Ino's mind to infiltrate Konoha. Ino has to find a way to communicate with Naruto's consciousness and stop the enemy's plan from within Naruto's body.
One interesting concept could be the use of the mind transfer jutsu for espionage. For example, a character could transfer their mind into an enemy's body to gather intelligence. Another concept might be the moral implications of using such a jutsu. What if it was misused to frame someone? And also, the idea of a character getting stuck in another's body due to a failed mind transfer jutsu can lead to some really comical or tense situations in fanfiction.
Naruto himself is often involved. Since he's the main character, fanfiction writers like to explore how he would use or be affected by the mind transfer jutsu. Sasuke is another common one. His complex personality and powerful abilities make for interesting scenarios when combined with the mind transfer jutsu. Kakashi too, as he is a very intelligent and experienced ninja. Writers might explore how he would use the jutsu for strategic purposes.
Often, Ino is initially shocked. After all, Naruto might not be the person she expected to ask her out. But then she might show her kind side and accept. For example, she could blush a little and say yes with a shy smile.
I think Naruto would be heartbroken. He's always been so open and sincere in his feelings. When he discovers Ino has cheated on him, he might go on a bit of a self - discovery journey. He'd wonder what he did wrong, even if it wasn't his fault at all. He could also become a bit more cynical about love, which would be a big change for him. He might start to see the world in a different light and be more guarded in future relationships.
Naruto might initially be shocked or confused. For example, if they prank him with the fake ramen, he'd probably make a really funny face when he takes the first bite. But then he'd probably laugh it off because he has a good sense of humor.
He could be touched. Despite his stoic exterior, Itachi may see this as a genuine and innocent gesture from Naruto, and it could warm his heart in some way. Maybe he starts to see Naruto in a new light, as someone who can bring a bit of light - heartedness into his world of shadows.
Ino would likely be very concerned. She might immediately try to use her mind - reading skills to figure out what has happened to Naruto. If she can't break the hypnosis right away, she'd probably seek help from her teammates or sensei. Ino is a determined character, so she won't give up easily on saving Naruto.