Is this a joke? I see a watermelon, not a Suika Ibuki...

Pixiv title: "Let's Go to Brazil With The Family." (さあ行こう 一家をあげて ブラジルへ)
It's a parody of a poster used in Japan to attract immigrants to Brazil.

http://en.wikipedia.org/wiki/File:Affiche_%C3%A9migration_JP_au_BR-d%C3%A9b._XXe_s..jpg

I don't see why Yukari and Suika would be tagged here. They're neither visible, nor is anyone made to resemble them.
Just because there is a pun regarding them shouldn't warrant their tag IMHO.