You can start by looking on popular fanfic websites like FanFiction.net or Archive of Our Own (AO3). Just use the search bar and type in 'ino yamanaka x sasuke fanfic' and it should bring up a list of relevant stories.
One popular ino yamanaka x sasuke fanfic could be 'The Unlikely Bond'. It explores their relationship in a new and interesting way, perhaps with Ino helping Sasuke deal with his past traumas while also developing romantic feelings for each other.
Perhaps the OC is from another village on a diplomatic mission. Ino is assigned to show the OC around Konoha. At first, they have some misunderstandings due to their different village cultures, but as they get to know each other better, they realize they have a lot in common and fall in love.
One idea could be a fanfic where Ino Yamanaka uses her mind - transfer jutsu in a completely new and unexpected way, like transferring her consciousness into an animal to gather intelligence for the Hidden Leaf. Another could be a story about her opening a flower shop that also serves as a front for a secret shinobi information exchange.
Naruto would be a fun character to pair with Ino. Naruto's positive attitude and his ability to befriend anyone could bring out a different side of Ino. They could be on a mission to rescue someone, and Naruto's strength and Ino's intelligence would make them a formidable team.
First, you need to develop your OC well. Give them a unique backstory, personality traits, and goals. For example, if your OC has a troubled past, it can add depth to their relationship with Ino. Then, focus on the interaction between them. Use dialogue to show their chemistry. Don't rush the relationship; let it develop gradually.
The theme of growth is also prevalent. Both characters grow as individuals through their relationship. Ino might become more empathetic towards Sasuke's struggles, and Sasuke might learn to be more open and less isolated. In some fanfics, they face challenges together that force them to step out of their comfort zones and grow in ways they wouldn't have on their own.
A common theme is also about breaking barriers. In the Naruto universe, there are social and personal barriers between them. Ino is from a different clan and Sasuke has his own issues. Fanfics often explore how they break through these barriers to be together. Also, the theme of growth is present. Both characters grow as individuals while also growing in their relationship with each other.
Ino might be really bossy towards Naruto at first, like she is with others. But Naruto's carefree nature could gradually break down her tough exterior. For example, he could make her laugh during a serious mission, which would change their dynamic.
Well, 'Ino's Quest for Sasuke's Heart' is also a great one. In this fanfic, Ino decides that she wants to win Sasuke over. She tries all sorts of things from cooking for him (even though she's not the best cook at first) to training with him to show her strength. It shows a more comical and light - hearted side of their relationship as she bumbles her way through her attempts to get closer to him.