
Chap 1, panel 14:
Sis - "Let's take a bath and sleep together tonight!"
ML - "Sleeping together is fine, but the bath is a no."
Sis - "What the heck!? I'm gonna married soon! I want some background info on this kinda stuff!"
ML thought - "I'm ten years old after all. I don't think I can restrain myself if I took a bath with a lady."

This is historical fiction (in a sense), so marrying young would be a thing, thus the need to know how to do the deed at the age of ten. Also (in case moral compasses are spinning), in later chapters it’s made clear that medical practices are still in the early-mid stages, so people are probably not living much beyond the age 40 or 50, so marrying young (by modern standards) would be a thing. That being said, the author does make a point that marrying at age 10 is a little absurd (Shin does it for a reason, read to find out), so modern standards are not completely out the window
Am I the only one that kind of hated this? And I'm only at the second chapter...
It's just too much "non-sense", they are ten years old, but keep acting and being treated as young adults, the sister saying things like sleeping and taking a bath together so she can LEARN about her NIGHTLY DUTIES???? That's insane.