I'm not certain. It depends on the information provided on the Wikipedia entry for that particular work. Sometimes it's clearly stated, but other times it might not be so straightforward.
I'm sorry, but without more context, I don't know the specific 'lucas y cristina secret story'. It could be about a friendship, a family mystery, or something else entirely.
One guess could be that it has to do with a gift they gave each other secretly. For example, Lucas might have given Cristina a special handmade item, and they've kept it a secret from others because it's a very personal symbol of their relationship. Another possibility is that they have a secret code or language that they use only between themselves.
I'm not a fan of online novels. I'm just a person who likes to read novels. As for whether Blazing Teens will have a sequel, I can't give an accurate answer. It seems that there is no official announcement that there will be a sequel to this work, so I can't provide any information about it. If you want to know more about Blazing Teens: The Legend Reappears, you should go to the relevant novel websites or social media platforms to search.
If Yo - Yo was captured, it could lead to some interesting character development for the other agents. Fitz and Simmons could be pushed to develop some new gadget to help in the rescue. Daisy might be forced to confront her own fears about losing her friend and use her powers more aggressively. Also, the captured situation could be a setup by a new villain who wants to lure the rest of the team into a trap. The villain might be after the secrets of SHIELD that Yo - Yo knows.
The 'hide yo kids, hide yo wife' is a phrase from a viral video. A man named Antoine Dodson was interviewed after his sister was the victim of an attempted sexual assault. His very animated and passionate reaction in the interview, where he said things like 'Hide yo kids, hide yo wife' became extremely popular and was remixed and spread all over the internet.
Antoine Dodson was the main person involved. His sister was also involved as she was the victim of the attempted sexual assault that led to Antoine's now - famous interview.
The 'hide yo kids, hide yo wife' originated from a viral video. In the video, a man named Antoine Dodson was being interviewed about an attempted burglary at his sister's house. His passionate and somewhat comical warning of 'hide yo kids, hide yo wife' became an Internet meme very quickly. It spread across the web and was used in various forms of remixes and parodies, which made it gain huge popularity.