BAD BI*$H ALERT Ban x black reader

y/n is part of the demon race along with her older brother sir Meliodas after the holy war that happen 3,000 years ago sir Meliodas and y/n leave along with goddess Elizabeth, after that they put a curse on them

when forming the 8 deadly sins ban and y/n fall in love
but that love did last for when the kingdom blames them for killing the king, they use a some kind of magic to sell y/n away and put to the deaths of the ocean sealing her away

what happen when they reunite and the ten commandments come back
will y/n get her happy ending or will she be die in peace alone