Well that's kinda weird saying he belongs to you i would never say that to my brother like wtf it sound so weird..If she had said "even so i won't allow you to have him" this would have sound appropriate because it sounds like i want to protect him...So it's just me.
I think it is a Japanese thing where it'd normal for sis-con or bro-con and they have the need to be separated from their sibling because they had "none-normal feelings" and many anime and manga have that in***st tag. So, it's weird for her to word it like that without giving it a double meaning.
Well that's kinda weird saying he belongs to you i would never say that to my brother like wtf it sound so weird..If she had said "even so i won't allow you to have him" this would have sound appropriate because it sounds like i want to protect him...So it's just me.