Since I don't have access to the 'yamada's first time lemon fanfiction', I can only make assumptions. Maybe it's about a character named Yamada and their first encounter with a significant event or person. But again, this is just speculation.
I'm sorry, but since I don't really know what 'yamada's first time lemon fanfiction' is about, it's hard to recommend similar ones. You could try searching on fanfiction platforms using keywords related to the general idea you think it might have, like if it seems to be a slice - of - life story, search for slice - of - life fanfictions.
Futaro Yamada was a famous Japanese novelist and anime director. His works included many popular novels and manga, some of which had been adapted into animation.
The following are some of Yamada Futaro's works and their corresponding animated versions:
[1]"Tengen Breakthrough the Red Lotus Rock": This novel was adapted into an animation called "Tengen Breakthrough the Red Lotus Rock".
2 Death Note: This novel was adapted into an animation called Death Note.
3. The Hunger Games: This novel was adapted into an animation called The Gentle Girl.
4. Battle of Chicken and Fish: This novel was adapted into an animation called Rabbit Proof Hole.
[5]"Women's Mountain Range": This novel was adapted into an animation called "Women's Mountain Range"(Ouran High School Host Club).
These works were very popular and were adapted into animations, which also achieved great success.