When they were kids, seme saw uke crying and assumed it was because of his niichan ... but then the mother talked about how uke and niichan were always fighting because of seme, so it made me kinda hopeful that he was crying because of seme instead... if i believe that this is the case then maybe uke's sudden decision (10 years later) to date him isnt really sudden at all??? It would mean he's always had feelings for him, but was just unsure about what those feelings were?? I dont know
I try to avoid books abiout incest or about step siblings but for yuuto i endured it till the end...