User blog comment:FrankieX98/The future members of the Issei's harem and peerage./@comment-2208155-20181016203958/@comment-2208155-20181017083227

I doubt that something like that would have happened with Grayfia. The comment talks about the feelings(love feelings) of other people for Issei.

She was destined to this in the moment that Ishi said Quartet Church(the other 3 are in Issei harem) and put her in Issei house.