The robotboy and robot girl cartoon usually has cool designs and exciting adventures. The robots have unique abilities and they face various challenges together.
Well, perhaps in the 'lethal winking scary story', the winking could be a signal of some malevolent force. It could be that whenever someone winks in a certain way, it triggers a series of terrifying events. Maybe it's a curse that spreads through this unusual form of communication. However, without reading the story, this is all just speculation.
Since we lack the details of the 'Mona Darling full story', it's difficult to define who Mona Darling is precisely. She might be a protagonist in a love story, facing challenges in her relationship. Or she could be a strong - willed character in a thriller, fighting against some sort of danger. There are countless possibilities depending on the nature of the story.
The lethality of succubi in fiction really varies. It could be that in one story they're extremely dangerous and fatal, but in another, they might just be a source of temptation without being directly lethal.
There are no appropriate 'lemon' fanfics to recommend as 'lemon' implies adult and improper content. Instead, you could explore general Robotboy and Robotgirl fanfics. For example, some might focus on how they interact with the human world, or how they deal with challenges specific to being robots in a human - dominated society. These types of fanfics can be really interesting and engaging without any inappropriate elements.
Archive of Our Own (AO3) might have some. It has a wide range of fanfictions for various fandoms, and there could be some dedicated to Robotboy and Robotgirl's love. The platform allows writers to explore different themes and interpretations of characters' relationships.
Another theory is that it might be a composite of several different women. However, historical evidence mostly points towards Lisa Gherardini. She lived in the same time and place as Leonardo da Vinci, and the connection through her husband's commission is a significant factor.
There could be fanfictions where Robotboy and Robotgirl go on adventures together and their love blossoms during those experiences. Maybe in one, they save a city from a big threat and realize their feelings for each other in the process.