I've never known why you need "the talk". My parents never sat down and had a dramatic talk about how babies are made. Even so I, more or less, understood what was going on when I was like... I don't know? 6? I didn't know EXACTLY what happened until sexual education in school, but you get my point.
The idea was more like spike had a bad dream and twilight decides to lovingly read him a bedtime story about dragons...all her books are pretty much educational so then this happens. Annnnd cue twilight being clueless.
Ahahah! Hey, neat! Never knew it was on reddit. But oh well, again, it's just a funny idea I had after watching the "Dragon Quest" episode, like, maybe twilight writes down what she observes while she's there, publishes a book, shares it with spike type deal But if people want to take it to a more mature direction then I can't stop them ;v;