User blog comment:Phineas7897/ferbs girlfriend/@comment-419569-20091025185337

Bah, if you ask me, the only reason a Ferb/Gretchen relationship has not been shown yet is because Dan and Swampy just haven't seen the fandom it's gathered. You can't expect me to believe that they honestly approve of pedophilia.

Besides, the idea of Baljeet/Ginger was never hinted at nor even actually supported till "Isabella and the Temple of Sap" (which also shows that Gretchen's a genius, which gives her common ground with Ferb). What's to say the same thing won't happen with Ferb/Gretchen?