Well, 'The Unspoken Love of Ritsu and Masamune' is also great. It delves deep into their unspoken feelings, slowly building up the tension and romance in a very believable way. It shows how their relationship could develop over time with all the little nuances and details.
You can start by looking on popular fanfiction websites like Archive of Our Own (AO3). It has a large collection of various fanfictions, including ritsu x masamune ones.
Love and reconciliation are very common themes. Their relationship has a lot of history and baggage, so many fanfictions focus on them working through past issues to be together.
One popular 'onodera ritsu x takano masamune fanfiction' is 'A New Beginning'. It shows their relationship developing in a modern AU setting. The author does a great job of capturing their personalities.
The theme of second chances also pops up a lot. Their relationship had a rocky start, and fanfics like to play with the idea of them getting a second chance at love. It gives the writers a chance to explore different ways their relationship could develop and how they can make it work this time around.
One great 'onodera ritsu x masamune takano fanfic' is 'A Chance Encounter'. It beautifully portrays their relationship with well - written dialogues and emotional depth. The author does a wonderful job of showing their evolving feelings for each other.
A common theme could be friendship development. Since they have an interesting dynamic, many fanfictions might explore how their friendship grows deeper.
Another theme is the exploration of new worlds. Ritsu might be from a different world or have a different lifestyle than Naruto. This allows for the fanfiction to explore how they each view and interact with the new or different elements in their joined story. It can be really fascinating to see how the two characters adapt and how their worlds collide in these stories.