Harem end confirmed here.... we saw important people like other family members but never saw sisters there, the author has been carefully hiding them for the end reveal while leaving many hints like "wedding Rings" "Bride's" "name's" which were mentioned by rahia and then later the mentioned of legend again with 6some handholding confirming it. others could already be at the chapel we never saw the stage anyway. if it still doesn't end in harem or author chickens out in the end then im sure many will be super pissed.
Though 1 thing im disappointed about is that fuutarou never went to his original blond hair in the future, he still has that dull and ugly hairstyle and still looks like a succubus is still succing his life force out from him.