Good cause once we go to the forest the next logical step would of course be (after Saria explains the situation) to set off for the Fairy Realm. Oh and if you want to come Lug it's lucky for you cause unlike the fairies in the Twilight Realm Twili can survive in the Fairy Realm. Albiet it a bit uncomfortably, given the environment they are used to the Fairy Realm would seem impossibly bright. It should be fine for humans given the kind of environment they come from.