since "Reo helps Nagi get dressed" is practically canon at this point, my domestic "Reo does Nagi's tie for him every morning" married couple hc isn't too far-fetched it seems.
Nagi "it seems i used up all my life's luck in this whole romance thing. I might not get that SSR card but i got the prettiest boy in class to hug my arm on a date" Seishiro.