Its also rare for a SO to have to ask perms from lil sis to be able to date big bro LMAORare to see manga characters be this self-aware that they are into each other.
Its a japanese custom to ask for the blessing from a family member of your person of interest, which since in this specific case, the parents are not available, so the next one available would be the sister.Its also rare for a SO to have to ask perms from lil sis to be able to date big bro LMAO
I take it the logic behind it is similar to getting someone's kid to agree with their dad dating a new person.Permission? She the younger sister, not the parent or guardian.