Well, they'd probably have a lot of fun. Naruto's energetic nature would liven up their living space. They could have friendly competitions like who can clean the room the fastest or who can cook the best ramen. And at night, they might sit and tell stories about their adventures, with Shisui sharing some of the more secretive missions he's been on in the village.
They could get into all sorts of trouble together too. Maybe Naruto accidentally breaks something in their room and they have to figure out how to fix it without getting in trouble with their landlord. Or perhaps they get involved in a village - wide prank that goes a bit too far and have to make amends. Their different personalities would surely create some interesting and chaotic situations.
Perhaps Naruto saves Shisui from a group of rogue ninjas. He uses his speed and agility, enhanced by his training with Jiraiya, to quickly reach Shisui. His Nine - Tails chakra could also flare up, intimidating the enemies and giving him the power to fight them off.
A very strong bond. Naruto is known for his ability to make friends easily, and Shisui, with his kind heart, would be open to Naruto's friendship. They'd likely become like brothers, always having each other's backs. For instance, if Naruto got into a fight with someone in the village, Shisui would be right there to support him, and vice versa.
Well, he might gain the power of Shisui's Sharingan abilities. Naruto could potentially use Shisui's powerful genjutsu skills. It would make him even more formidable in battles against tough opponents like the Akatsuki members.
Well, if Naruto gets Shisui's Sharingan in a fanfiction, he could gain some really cool abilities. The Sharingan has powers like enhanced perception and the ability to copy jutsu. Naruto already has his own powerful chakra and skills, so with the Sharingan, he might become an even more formidable ninja. He could potentially use the Sharingan's genjutsu capabilities to his advantage in battles, maybe even use it to break through tough enemy defenses more easily.
One possibility is that Naruto would gain incredible new abilities. Shisui's Sharingan had unique powers like Kotoamatsukami. With it, Naruto might be able to influence others in a more subtle way. He could use it in battles to deceive opponents or even resolve conflicts without direct combat. For example, he could use it to make enemies see illusions of peace and lay down their weapons.
One possible plot could be that Ino is in a situation where she needs to quickly gain Shisui's attention or stop him from doing something. Straddling him might be a very bold move on her part in the heat of the moment. Maybe they are in the middle of a battle or a dangerous situation where she uses this tactic as a last - ditch effort to communicate or make him listen.
One possible plot could be that Shisui discovers Naruto living in a difficult situation, perhaps being ostracized in the village. Shisui decides to take him in. He then starts training Naruto in his unique ninja skills. Naruto would grow up with Shisui's values and teachings, and this would change the way he approaches his goals in the ninja world.
One possible plot could be that Shisui imparts his unique Sharingan - related skills to Naruto. For example, he might teach Naruto how to predict opponents' moves better, just like how the Sharingan can analyze the flow of chakra and movements. This would give Naruto an edge in battles, especially against strong opponents who rely on speed and deception.
Shisui, on the other hand, would probably be more open and friendly towards Sarada right away. He could share some of his own experiences with her, especially about loyalty and friendship. Maybe he would teach her some of his unique jutsu techniques in a friendly sparring session. Sarada would surely be in awe of these two legendary shinobi and learn a great deal from them, which could shape her future actions and decisions in the fanfiction.
In this fanfiction, Shisui could be a mentor figure to baby Sarada in a way. He might not be able to be there all the time, but when he is around, he imparts some of his wisdom. He could teach her (in a very basic sense for a baby) about the importance of loyalty and courage. He may also give her a special gift that has some connection to his own powers, like a pendant that can enhance her chakra control when she grows up, starting her on a path of becoming a strong ninja.