This could've been sweet, but the fact that they didn't even ask their "new" fiancés, unsweeted it for me in no time.
The girls didn't even think of switching partners, they wanted to be with their original partners and didn't seem to have a change of heart on their own.
It just seems kinda selfish to just decide "you'll marry me now and you'll marry my brother, since we want to be happy." well, are your girls also going to be happy?
Of course they are, since it's a "happy ending" oneshot, but still I can't call it cute.