arcane akaashi X Blk reader

haikyuu X modern monsters au
where y/n is merfolk she always wished to go on land but could never find the means to do so until while lounging on the bank of a small creek she met a dark avian male promising to give her the world

few things
character ages range from 23 to 29
i plan on making this rather sad please be advised
Y/n has more of a oc based personality bc i find it hard to write blank slates