Sharing such a story is completely inappropriate and violates privacy and ethical boundaries. It involves very private and often sexual content that should not be casually disclosed.
As far as I know, Homelander doesn't drink milk. The focus in the comics is more on his superpowers and villainous actions rather than his beverage choices.
Lvl.Big Brother, Sister-in-law Gu Yan, Drink A Cup Of Milk Tea is an ancient novel, and the author is Drink A Cup Of Milk Tea. The specific content and plot of this novel could not be found from the search results provided.
In most cases, snakes don't drink milk. Their digestive systems aren't adapted to process dairy. They usually consume prey or other suitable foods found in their environment.
Rather than delving into such inappropriate stories, we should uphold good moral values and promote healthy family interactions. There are many other positive topics like family achievements, shared hobbies within the family that are worth discussing.
There was one that recommended "The Beginning of Douluo, A Deer". The main character, Qin Huan, had turned into a deer and started cultivating from drinking milk. I hope you like this fairy's recommendation. Muah ~😗
A good approach would be to educate her about the body in a general sense. Start with basic body parts and functions. Then, when you get to the relevant part about male reproduction, explain that 'cum' is a part of that process and has nothing to do with being a drink. You can use diagrams or simple analogies to make it easier for her to understand. Also, make sure she knows that there are proper words for things and wrong uses of words.
First, you need to have a proper conversation with her. Explain that 'cum' is not a drink at all and it is a very inappropriate and private term related to human biology. Maybe she heard it wrongly or got misled. Use simple and clear language to correct her misunderstanding.