Don't go that way, i don't want an end where they marry random guys. There are countries who does same sex marriages, hell i think they're even prefectures in Japan who accept same sex marriages.
Not full-on marriage but something akin to registered partnership. Wikipedia has some info: https://en.wikipedia.org/wiki/Recognition_of_same-sex_unions_in_Japan
@RexNemorensis : Yeah I love when Torajirô brings new stuffs. Often in those kind of important moment. With this blushing, he perform a new perfect, like it did with Yuu when she said "I'm always wonderful". Just the right moment to make the perfect drawing.