Madagascar is purely fictional. The story and characters were invented by the creators to provide an enjoyable and imaginative adventure for the audience. There's no real-life basis for it.
I have no idea who might be involved in this 'fixing the sink sex story' as there's no context provided. It could be a couple, like a husband and wife, where the act of fixing the sink creates some sort of situation between them. Or it could be a plumber and a homeowner, and some sort of relationship or encounter develops during the sink - fixing.
I'm not sure specifically what the 'fixing the sink sex story' is. It could be a fictional or real - life story where something related to fixing a sink somehow ties into a more complex narrative, perhaps a relationship - related situation or a comical incident in a domestic setting.
Well, a fanfiction about Joey in love in 'Penguins of Madagascar' could be really interesting. Maybe Joey falls in love with a new character introduced in the story, like a female penguin from a different colony. They could meet during an adventure, and Joey is instantly smitten. He might then try to impress her with his unique skills, like his ability to find the best fish in the ocean.
There could be many fanfictions about Baby Alex from Madagascar. It might focus on his early days in the zoo, his interactions with other animals there. For example, it could describe how he played with the other young animals, or how he first discovered his love for dancing.
It allows for a deeper exploration of the penguins' personalities. For instance, Rico's mysterious past or Private's insecurities can be delved into more deeply in fanfics. This gives fans a chance to understand the characters on a whole new level and makes the fanfics very appealing.
Harry Potter himself would probably be a main character. After all, he's the hero of the original series and would likely be at the center of any attempt to fix the future. Hermione Granger would also be a key figure, with her intelligence and knowledge of magic.