for the people confused its about the pregnant thing its just dirty talk lol. Usually in bl's the bottom is the one who says things like that but the author wanted to make it different and have the top be the one with the "dirty mouth"
i dont think they are gonna make the brother the second lead. When people reincarnate they sometimes end up making up for their past life with their new life. Idk but maybe the brother is creepy and possessive in the past life but just a normal overprotective brother in the current life
read this before the sides were up and it was okay, but now with the sides its 10x more cuter