I think the artstyle worsening the situation FL seems to be 10 years old currently, when in reality FL's mother left when she was 10 years old, and then she spent years abused, and now she can be married so she is somewhere 14-16 years old.
When they first meet ML seems to be 10-12 years old and she is like 2-3, so the age gap is like 10-12 years max. What is usual in Historycal setings, but the artstyle making it mush worse, I do not know whta the illustrator thought... I thought first that maybe it's some kind of spirit thing and she aging differetly, but MCs maid is the same and seems 10 years old, but she is a pull pledged maid so she is in the same age as MC.
hes a grown ass man and she looks and acts like a 10 year old the plot is interesting but i cannot get over the age gap like it gets to a point where it is just straight up PEDOPHILA. and he knew her when she was a baby too i cannot. the one panel of them standing next to each other in chapter 25 (i think) was abysmal bro like she legit looks like a 5 year old i cant