Yes, there are some really nice ones. You can start by looking on fanfiction websites like FanFiction.net or Archive of Our Own. Just search for 'Miroku and Sango kiss' in the search bar and you'll likely find several stories that focus on their relationship and such romantic moments.
One great 'miroku and sango fanfiction' is 'The Unspoken Bond'. It beautifully explores their relationship development. Another good one could be 'Journey Together' which takes them on an adventure and shows how they support each other. And 'Love in the Midst of Chaos' is also a popular one that delves into their feelings during a difficult time.
A fanfiction could focus on their relationships. For example, how Sango and Miroku's relationship develops further with Kagome and Rin as witnesses. Maybe Kagome gives Sango some advice on dealing with Miroku's flirtatious nature, and Rin looks up to them as a couple, learning about love and relationships from them.
One common theme is their relationship development. Since they are a couple in the Inuyasha series, many fanfictions explore how their relationship grows and deepens over time. Another theme is their adventures together. They often go on quests with Inuyasha and the others, and fanfictions might focus on their roles and experiences during these adventures.
I haven't actually read this specific 'Miroku and Sango Lemon Fanfic' in detail. But generally, fanfics about these two characters can be really interesting. They often explore the relationship between Miroku and Sango in unique ways that might not be fully explored in the original work. If it's well - written, it could add more depth to their characters and their connection.
You can start by looking on fanfiction.net. It has a large collection of fanfictions including many about miroku and sango. Another good place is Archive of Our Own (AO3). There are often some really well - written stories about them there.
In a fanfiction, there could be a prophecy about four individuals who will bring balance to a certain region. Kagome, Sango, Rin and Miroku are thought to be those four. But there are also those who don't want the balance to be restored. So, they constantly face attacks and attempts to stop them. They travel from place to place, gathering allies and learning more about the prophecy. Miroku studies ancient texts for more details about the prophecy, Sango trains with local warriors to improve their combat skills, Rin helps with diplomatic relations among the different groups they meet, and Kagome uses her powers to protect them from magical attacks.
Another fanfiction could explore the reactions of their friends to the news. Inuyasha might be initially gruff about it but secretly happy for them. Kagome could be super excited and offer to help Sango with any pregnancy - related problems, like morning sickness remedies or advice on baby clothes.
Often, these fanfics highlight their opposite personalities. Miroku is more of a flirty and carefree character, while Sango is strong and serious. Their interactions create a lot of interesting dynamics.
FanFiction.net is a great place to start. It has a large collection of fanfictions from various fandoms, including ones about Miroku and Sango. Just type in the relevant keywords in the search box.