One common theme is the exploration of their family bond. Since Kushina is Naruto's mother, some fanfics might show a tender moment of a kiss as a symbol of their deep connection that was lost due to her early death in the main story. Another theme could be alternate universes where they get to interact more freely and develop a romantic relationship that leads to a kiss.
There might be a fanfic where Kushina is brought back to life briefly, and in that short time, she shares a kiss with Naruto as a way to convey all the love she had for him that was cut short when she died. It could also be a fanfic set in an alternate universe where the circumstances are different, and Kushina and Naruto have a closer bond than in the original story, leading to a kiss.
I haven't come across a fanfiction with the exact title 'Naruto is Kushina's Sensei Kiss'. Fanfiction can cover a vast range of ideas and relationships, but this one seems rather unorthodox. It might not be a common theme. However, the Naruto fanfiction community is huge, so it's possible that someone has written something along those lines. Check different fanfiction platforms and use their search functions to be sure.
An interesting setting could be in a dangerous situation. For example, Naruto is in the middle of a battle and is about to be defeated. Kushina appears (maybe as a spirit or some other form) and gives him a kiss that empowers him, allowing him to turn the tides of the battle.
Another place to check could be some Naruto - dedicated fan forums. These forums often have sections for fanfiction, and members might share or recommend 'Kushina Kiss Naruto' fanfics. Reddit also has Naruto - related subreddits where fans might discuss and share links to such fanfics. Just be sure to follow the rules of each platform when searching for and accessing fanfiction.
One possible plot could be a flashback story. Maybe it's Kushina's last moment before her death and she gives Naruto a loving kiss as a final goodbye and a transfer of her unwavering love and protection. It could also show Naruto's reaction to this unexpected and bittersweet moment, perhaps giving him newfound strength and a deeper understanding of his mother's love.
There are fanfictions where Kushina's kiss is a sign of her forgiveness. Maybe Naruto made a big mistake in the story, and Kushina's kiss is her way of showing that she still loves him and believes in him. It could also be a part of a romantic sub - plot in a fanfiction. For instance, if the story has a bit of a twist where Naruto has feelings for his mother (not in a creepy way, but more in a spiritual connection sense), and the kiss is a moment of deep emotional connection between them.
The kiss can be a turning point. For example, it might inspire Naruto to strive harder in his training. If he was feeling down or doubting himself, the kiss could give him the motivation he needs.
Well, it could be a really strange plot. Maybe it involves some sort of time - travel or alternate universe where Naruto has to take on the role of Kushina's sensei in a very different ninja world setting, and the kiss could be a symbol of some deep - seated connection or a way to transfer power. But this is all just speculation as I haven't actually read such a fanfiction.
Well, another option is to follow some well - known Naruto fanfic writers on platforms like Tumblr or Twitter. They may post links to their works or recommend other great fanfics. It's important to note that the quality can vary greatly, so it might take some time to sift through and find the really good ones that feature Naruto and Kushina's kiss in a way that's well - written and in - character.