Wait... was the little sister literally trying to insinuate that her brother was gay to his fiancée just so that she could get the engagement annulled and then be the one to marry her?
I wouldn't feel bothered if the girl wasn't 11 or 12 (I think) so there is that. Also, is the guy really in love with the fiancé? I kept thinking he was just a fiend up to the last panels where it shows the 4 of them in a sort of showdown
@omegaxis1 No. She was being a fujo in the beginning which is why she wanted the Duke's daughter to call off the engagement. After she was saved she asked her brother to annul because she had fallen in love.