If they absolutely have to include fillers, I want a musical!world, where everything you say must be expressed through singing. Our usually so outspoken ninja would probably be very silent in such a place... but, alas! in exchange of giving the gang the feather of this world, Queen Tomoyo, chosen for her divine voice, demands a musical performance staring all five of the travellers. Most of the episode will then consist of everyone trying to convince Kurogane to sing his part, but in the end, it is Tomoyo who manages to persuade him to do so by granting him a brief kiss on the cheek (insert Kurogane blushing and shyly agreeing to do anything to please her).
Our heroes pull the performance off with grace: Syaoran does well, and even though Sakura is too shy to sing with all her heart, Tomoyo judges that her cuteness makes up for it. Fai then spellbinds the audience with a touching ballad of how much he misses Chii, and the episode ends with Kurogane and Tomoyo singing a cute duett together.
Enough Het Parade and Kurogane character-raping for BT, you think?